Physics Holiday Homework Answers PDF

## Figure 1 and Figure 2 show the interaction between a bar magnet P and a bar Q of an unknown material: * **Figure 1** shows bar magnet P with its North pole pointing towards bar Q and the south pole pointing away. The arrow indicating attraction between the two bars. * **Figure 2** shows bar magn...

## Figure 1 and Figure 2 show the interaction between a bar magnet P and a bar Q of an unknown material: * **Figure 1** shows bar magnet P with its North pole pointing towards bar Q and the south pole pointing away. The arrow indicating attraction between the two bars. * **Figure 2** shows bar magnet P with its south pole pointing towards bar Q and the north pole pointing away. The arrow indicating attraction between the two bars. ### Question: Which of the following materials will be attracted by bar Q alone? | Option | Material | |---|---| | A | iron | | B | wood | | C | plastic | | D | (none of the above) | ## When two ring magnets P and Q, are placed in the four arrangements shown in the figure below, they attract each other in some positions and repel each other in some positions: * **Arrangement 1** shows two rings, one labelled "Magnet P" and the other "Magnet Q", positioned one above the other. The arrow pointing up above Magnet P indicates that it has been rotated. * **Arrangement 2** shows Magnet P rotated as in Arrangement 1 and Magnet Q flipped upside down. * **Arrangement 3** shows Magnet P flipped upside down and Magnet Q rotated. * **Arrangement 4** shows Magnet Q flipped upside down and Magnet P rotated. ### Question: Based on these observations, which of the following positions of the poles of these ring magnets is NOT possible? | Option | Description | |---|---| | A | Shows the magnet with the north pole on the outside of the ring and the south pole on the inside.| | B | shows the magnet with the north pole on the inside of the ring and the south pole on the outside.| | C | Shows the magnet with the south pole on the outside of the ring and the north pole on the inside.| | D | Shows the magnet with the south pole on the inside of the ring and the north pole on the outside.| ## Bharat watered the garden using a pipe as shown here with attached nozzles: A diagram shows a hand holding a pipe and water spurting out of a nozzle attached to the end of the pipe. ### Question: He used each of the following nozzles on the pipe one after the other. Which of these nozzles will make the water from the pipe reach the FARTHEST, if the flow of water in the pipe is not changed? | Option | Diagram | |---|---| | A | Shows a pipe with a nozzle attached that is narrower than the pipe. | | B | Shows a pipe with a nozzle attached that has the same width as the pipe | | C | Shows a pipe with a nozzle attached that is wider than the pipe | | D | Shows a pipe with a nozzle attached that is narrower than the pipe | ## Look at people P, Q, R and S shown below: A diagram shows a building with a lamp on the top. There are four people labelled P, Q, R, and S. Person P is in front of the building on the ground, person Q is on a small structure on top of the building, Person R is on the roof of the building, and person S is a further distance along the ground from the building. ### Question: In the given positions, who will be able to DIRECTLY view the lamp? | Option | Answer | |---|---| | A | only P | | B | only R | | C | only Q and R | | D | all - P, Q, R and S | ## Normal ball-pens cannot be used to write on a paper held against the wall, in the position shown. A special type of ball-pen which writes when the paper is held in any position has been designed The diagram shows a person writing on a piece of paper attached to the wall, using a special ball-point pen. ### Question: Which of the following is most likely the special design feature of the ball-pen? | Option | Feature | |---|---| | A | The refill inside the pen contains more ink. | | B | It forces the ink to flow easily towards the tip. | | C | It has a better grip to prevent the pen from slipping. | | D | The ink used is less thick so it can flow easily towards the tip. | ## A uniform bar of iron is cut into two equal pieces P and Q. Piece P is heated and piece Q is cooled as shown below. The bar is cut here: A diagram shows two bars, labelled "Piece P" and "Piece Q" both the same size. The diagram shows an arrow pointing downwards from the centre of the bar above the two bars. Below Piece P is an arrow pointing upwards labelled "Heated". Below Piece Q is an arrow pointing downwards labelled "Cooled". Underneath the two bars are two sentences: "Expands upon heating" and "Contracts upon cooling". ### Question: Which of the following is likely to be TRUE about the weights of the hot piece P and the cold piece Q? | Option | Answer | |---|---| | A | weight of Piece P > weight of Piece Q | | B | weight of Piece P = weight of Piece Q | | C | weight of Piece P < weight of Piece Q | | D | (Nothing can be said without knowing the exact temperature of the two pieces.) | ## Two hollow pipes of different diameter are dipped in a tub of water: The diagram shows four tubs of water with two pipes in each. Each pipe is labelled "P" or "Q" and has a measurement "5 cm" or "7 cm" marked next to it. The water level in the pipes is labelled in litres, with the same markings on each tub. * **Tub A** shows the water level in both pipes at 15L * **Tub B** shows the water level in pipe P at 20L and the water level in pipe Q at 25 L. * **Tub C** shows the water level in both pipes at 15L. * **Tub D** shows the water level in pipe P at 20L and the water level in pipe Q at 25 L. ### Question: Which of the following shows the likely level of water in the pipes? | Option | Correct answer | |---|---| | A | A | | B | B | | C | C | | D | D | ## Which of these best describes periodic motion? | Option | Answer | |---|---| | A | motion that can be measured using a stopwatch | | B | motion where the object does not have constant speed | | C | motion in which the object moves along a curved path | | D | motion that is repeated after equal intervals of time | ## Azhar is working with the circuit shown in Figure I. He observes that with the switch closed, the bulb in holder 2 does not glow when there is no bulb in holder 1. But when he puts a bulb into holder 1, both the bulbs start glowing. He now adds another bulb and holder to the circuit as shown in Figure II: * **Figure I** shows a circuit with a battery, a bulb in holder 1, and a bulb in holder 2. The circuit is complete. * **Figure II** shows a circuit with a battery, a bulb in holder 1, a bulb in holder 2, and a bulb in holder 3. The circuit is complete. ### Question: On closing the switch of the circuit, which of the following will he observe? (All bulbs are working and the holders are identical.) | Option | Answer | |---|---| | A | Only the bulb in holder 1 glows. | | B | Only the bulb in holder 3 glows. | | C | Bulbs in both the holders glow. | | D | None of the bulbs glows. | ## Shown here are three pictures, P, Q and R show objects in motion. Each object has two points X and Y marked on it, as shown below: * **Picture P** shows a rocket blasting off from Earth. Two points, X and Y, are labelled and X is above Y. * **Picture Q** shows the rotating blades of a windmill. Two points, X and Y, are labelled and X is on one blade and Y is on another. * **Picture R** shows a spinning top. Two points, X and Y, are labelled and are on the top of the spinning top. ### Question: In which of them do BOTH the points X and Y move the SAME distance when each object is moving as shown above? | Option | Answer | |---|---| | A | P | | B | Q | | C | R | | D | In none of them. | ## A rope is passed around six nails on a wall, and two balls are attached to the ends as shown below, such that the arrangement is balanced: A diagram shows a wall with six nails attached and a rope looped around them, passing over the nails and then back on itself. At the end of the rope are two balls labelled P and Q. The rope is angled downwards next to P and angled upwards next to Q. There is an arrow pointing upwards next to Q labelled "direction of pull". Two points are labelled on the rope, R and S. ### Question: If Ball Q is pulled down slightly, how will the points R and S marked on the rope move? | Option | Point R | Point S | |---|---|---| | A | Up | Up | | B | Down | Up | | C | Up | Down | | D | Down | Down | ## Kevin pushed a balloon into a one litre bottle, P and stretched its mouth over the mouth of the bottle, as shown in figure 1. When he blew into the balloon, he found that he could only blow the balloon slightly, as shown in figure 2: * **Figure 1** shows a balloon stuffed into a bottle labelled "P". * **Figure 2** shows a balloon part way inflated and stuck inside a bottle labelled "P". ### Question: He repeated the procedure using the same balloon with another one litre bottle, Q. He observed that the balloon could be blown much bigger. Which of the following explains Kevin's observations? | Option | Answer | |---|---| | A | The bottle Q was made of plastic and bottle P was made of glass. | | B | The bottle Q was at a higher temperature than bottle P. | | C | The bottle Q had a wider mouth than the bottle P. | | D | The bottle Q had a hole in it and bottle P did not. | ## Monica saw some birds sitting on electrical wires: A photograph shows four birds perched on three electrical wires. ### Question: Which of the following explains why birds can sit on electrical wires without getting an electric shock? | Option | Answer | |---|---| | A | The birds use only one foot to sit on the wires. | | B | The birds are in contact with only one wire while sitting. | | C | The birds sit on the wires only when there is no electricity. | | D | The bird's feathers protect the birds from getting an electric shock. | ## Syed and Dipti walked from their respective homes to the same school without stopping anywhere. Syed took 15 minutes and Dipti took 10 minutes to reach the school: ### Question: What other information is needed to find out who walked faster to school? | Option | Information | |---|---| | P | the distance between Syed's house and the school | | Q | the distance between Syed's and Dipti's houses | | R | the distance between Dipti's house and the school | ## Which of the following set-ups should Gauri use to find out how the weight of a toy car affects the distance it moves when pushed once? (Note: All the cars are pushed with equal force in the direction indicated by the arrow.) The diagram shows four set-ups of toy cars being pushed by an arrow. * **Set-up A** shows a 100g car being pushed and a 50g car being pushed. * **Set-up B** shows a 100g car being pushed and a 100g car being pushed. * **Set-up C** shows a 100g car being pushed and a 100g car being pushed. * **Set-up D** shows a 100g car being pushed and a 50g car being pushed. ## A magnet is cut in the middle (along the dashed line) as shown below: The diagram shows a bar magnet with the north pole on the left and the south pole on the right. A dashed line is drawn down the middle of the magnet. ### Question: Which of these correctly represents the poles of the two cut magnet pieces? | Option | Answer | |---|---| | A | N S N S | | B | N N S S | | C | N S S N | | D | They won’t act as poles | ## Rima's parents noted her weight every year starting from the day she was born and after 10 years, they plotted a graph as shown below: A graph plots weight (kg) on the y-axis against age (years) on the x-axis. The line of the graph starts at 5kg at 0 years old and then rises gently in a slightly curved line until it reaches just over 30kg at 10 years old and then carries on up to just under 35kg at 11 years old. ### Question: What is the difference between Rima's weight at 12 years and 8 years? | Option | Answer | |---|---| | A | 15 kg | | B | 5 kg | | C | 4 kg | | D | (We cannot say based on the given information.) | ## Which of the following can take place WITHOUT any force acting on the object from the outside? | Option | Answer | |---|---| | A | a kite flying in the sky | | B | a mango falling from a tree | | C | a cricket ball losing its shape | | D| a lump of butter melting in the sunlight | ## Shown here is a harpoon, a type of weapon, used to hunt whales. The diagram shows a harpoon with a rope attached. A point, labelled X, is indicated on the harpoon. ### Question: What is the MOST likely function of the part 'X' of the harpoon? | Option | Answer | |---|---| | A | It helps the harpoon go deep into the whale's body. | | B | It helps in penetrating the thick skin of the whale's body. | | C | It prevents the harpoon from coming out of the whale's body. | | D | It prevents the harpoon from bending inside the whale's body. | ## The picture shows a steel arch erected across a road, in front of an underpass: The picture shows an underpass for cars, with a steel arch built over the road in front of it. ### Question: What is the likely function of the steel arch? | Option | Answer | |---|---| | A | to allow vehicles to pass only in one direction | | B | to keep vehicles on the correct side of the road | | C | to prevent tall vehicles hitting the top of the underpass | | D | to prevent vehicles from speeding in the underpass | ## Azhar is working with the circuit shown in Figure I. He observes that with the switch closed, the bulb in holder 2 does not glow when there is no bulb in holder 1. But when he puts a bulb into holder 1, both the bulbs start glowing. He now adds another bulb and holder to the circuit as shown in Figure II: * **Figure I** shows a circuit with a battery, a bulb in holder 1, and a bulb in holder 2. The circuit is complete. * **Figure II** shows a circuit with a battery, a bulb in holder 1, a bulb in holder 2, and a bulb in holder 3. The circuit is complete. ### Question: On closing the switch of the circuit, which of the following will he observe? (All bulbs are working and the holders are identical.) | Option | Answer | |---|---| | A | Only the bulb in holder 1 glows. | | B | Only the bulb in holder 3 glows. | | C | Bulbs in both the holders glow. | | D | None of the bulbs glows. | ## Shown below is the roller chain-sprocket wheel system of a bicycle. The pedal when pushed, makes the front sprocket wheel rotate. This movement of the front sprocket wheel is transmitted by the roller chain to the back wheel of the bicycle. The diagram shows a close-up of a bicycle chain and sprocket. ### Question: In which of the following, could the chain and sprocket system be seen operating? | Option | Answer | |---|---| | A | Car wiper | | B | Ceiling Fan | | C | Escalator | | D | Roller skates | ## Virat has a cell, a bulb and only one piece of wire. He connects the cell and the bulb using the wire in four different ways: The diagram shows four circuits created using a battery, a light bulb and a wire. * **Circuit P** shows the bulb connected to one of the poles on the battery with the other wire connected to the other pole on the battery. * **Circuit Q** shows the bulb connected to the positive pole of the battery, with the wire connecting the negative pole of the battery to the bulb. * **Circuit R** shows the bulb connected to the negative pole of the battery, with the wire connecting the positive pole of the battery to the bulb. * **Circuit S** shows the bulb connected to the negative pole of the battery and the positive pole of the battery connected to the side of the bulb with the wire going to the other side of the bulb. ### Question: In which arrangement will the bulb glow? | Option | Answer | |---|---| | A | only P | | B | only P and Q | | C | only P, Q and R | | D | all - P, Q, R and S | ## Sadhna wants to use the LEAST amount of wrapping paper to wrap the gift box shown below: The diagram shows a rectangular box. ### Question: Which of the following does she need to know about the box? | Option | Answer | |---|---| | A | only its length and height | | B | only its breadth and height | | C | only its length and breadth | | D | all - its length, breadth and height | ## Rubina has the sand clock shown below, where Bulb P is bigger than Bulb Q. It takes 15 minutes for all the sand to pass from bulb P to Bulb Q: A diagram shows a sand clock with the sand at the top in a bulb labelled "Bulb P" and the sand below in a bulb labelled "Bulb Q". ### Question: The sand clock is then turned upside down. How much time is it likely to take for the sand to pass from Bulb Q to Bulb P? | Option | Answer | |---|---| | A | 15 minutes | | B | less than 15 minutes | | C | more than 15 minutes | | D | (Cannot say without actually testing.) | ## Shreya observed the shadow of a lit oil lamp placed on the floor of a completely dark room, as shown below: The diagram shows a lit oil lamp with the flame burning at the top. The handle is sticking out to the left of the top of the lamp. Underneath, a shadow is cast, and the shadow shows no handle, but does have a distinct head shape. ### Question: She then raised the lamp above the floor, by its handle. What is likely to happen to the shadow of the lamp on the floor now? | Option | Answer | |---|---| | A | It will be bigger than the earlier one. | | B | It will be smaller than the earlier one. | | C | There will be no shadow formed on the floor after the lamp is lifted above the ground. | | D | It will be either smaller or bigger than the earlier one, depending on the height of the lamp from the ground. | ## The graph here shows the change in the heights of Murphy and Yasmin from the age of 5 to 17 years: A graph shows height (cm) on the y-axis against age (years) on the x-axis. The graph shows two lines. One is labelled "Murphy" and the other "Yasmin". The line labelled "Murphy" starts higher than the line labelled "Yasmin" at 5 years old and stays higher until the age of 12. Both lines rise gradually and then both start to curve upwards at around 10 years old. The line labelled "Yasmin" crosses the line labelled "Murphy" at 12 years old and stays higher until 17 years old. ### Question: Based on this graph, which of the following is TRUE? | Option | Answer | |---|---| | A | Yasmin was taller than Murphy for only 9 years of her life. | | B | Murphy was taller than Yasmin by about 20 cm at the age of 13. | | C | Both Yasmin and Murphy were about 150 cm tall at the age of 11. | | D | Both Yasmin and Murphy stopped growing taller after the age of 13. | ## Rebecca runs on a circular track every morning. At the start of her run, her shadow formed due to the rising sun is on her left hand side. She completes one round in 4 minutes: ### Question: What can be said about the position of her shadow during the run? | Option | Answer | |---|---| | A | It remains on her left hand side throughout the run. | | B | Its position continuously changes with respect to her position. | | C | It moves to her right hand side after half a round and remains there till the end. | | D | It remains on her left hand side initially but changes to her right hand side towards the end of the run. | ## Shown below is a table used to play table tennis: A diagram shows a table tennis table with a net stretched across the middle. There is a measurement "Height of net" labelled above the net. There is a measurement "Length of table" labelled below the table. ### Question: The height of the net is about 15 cm. What is the approximate length of the table? | Option | Answer | |---|---| | A | 1.0 m | | B | 3.0 m | | C | 5.0 m | | D | 7.0 m | ## Here is a picture of the Australian cricketer, David Warner, taken during a match: The photograph shows a cricketer about to hit a ball with a bat. ### Question: Based on the picture, what is he doing? | Option | Answer | |---|---| | A | running on the pitch | | B | jumping on the pitch | | C | kneeling on the pitch | | D | (It is difficult to predict based on this picture alone.) | ## Julie is trying to measure a liquid with the help of a measuring cylinder as shown above. She is observing it at eye level, but is not likely to get an accurate measurement: A diagram shows a person holding a measuring cylinder and looking at it at eye level. ### Question: What should she do differently, along with holding it at eye level, to help her get an accurate measurement of the liquid? | Option | Answer | |---|---| | A | hold the cylinder with both hands while measuring | | B | keep the measuring cylinder on a flat surface | | C | sit on the chair and then measure it | | D | use a thinner measuring cylinder | ## Nadira heated a container half-filled with a mixture of a spoonful of salt, a pinch of food colour and water. She covered it with a metal lid. She noticed that water droplets accumulated below the lid: ### Question: Which of the following is true about the water droplets below the lid? They will be ... ? | Option | Answer | |---|---| | A | salty but not coloured | | B | coloured but not salty | | C | tasteless and colourless | | D | coloured as well as salty | ## The ancient Chinese used a machine to separate mixtures made of two substances as shown here. The fan was rotated to produce a stream of air. Substance 1 came out from outlet 1 and substance 2 came out from outlet 2: The diagram shows a machine with a fan labelled "mixture inlet" with a spout coming out of the right labelled "outlet 1" and a spout coming out from the bottom labelled "outlet 2". ### Question: What is most likely to be true of the substances coming out of the spouts? | Option | Answer | |---|---| | A | Substance 2 is lighter than substance 1. | | B | Substance 2 is air and substance 1 is a liquid. | | C | Substance 2 is a liquid and Substance 1 is a solid. | | D | Substance 2 can directly be converted from solid to gas. | ## Which of these separates substances in a similar way to the Chinese machine above? The diagram shows four objects: a winnow, a filter paper, an evaporating pan and a butter churner. ### Question: Which of these separates substances in a similar way to the Chinese machine above? | Option | Answer | |---|---| | A | Winnow | | B | Filter paper | | C | Evaporating pan | | D | Butter churner | ## A circuit contains switches 1, 2 and 3, identical bulbs X and Y and a cell: The diagram shows three diagrams of electric circuits. Each has a battery and a light bulb labelled "Y". Circuit P also has a light bulb labelled "X" and a switch labelled "2", Circuit Q also has a light bulb labelled "X" and a switch labelled "2", Circuit R also has a light bulb labelled "X" and a switch labelled "2". All three circuits have a switch labelled 3. Circuit P also has a switch labelled "1", Circuit Q also has a switch labelled "1", and Circuit R also has a switch labelled "1". ### Instruction: All the switches are initially OFF. The following was observed when they were turned ON: * i When Switch 1 is turned ON, none of the bulbs glow * ii When Switch 1 and Switch 2 are ON, Bulb X glows * iii When Switch 1, Switch 2 and Switch 3 are ON, both Bulb X and Bulb Y glow ### Question: Which of the following circuits fit(s) the above description? | Option | Answer | |---|---| | A | only P | | B | only Q | | C | only R | | D | all - P, Q and R | ## Shown here are some street lights: The photograph shows a street at night with street lights along the side of the road. The light from the street lights illuminates the ground below. ### Question: The height of the lamp from the ground is increased two times. What is likely to happen to the brightness and the size of the patch of the light on the street? | Option | Size of patch | Brightness of patch | |---|---|---| | A | Bigger | More bright | | B | Bigger | Less bright | | C | Smaller | More bright | | D | Smaller | Less bright | ## In which case will the bulb glow? The diagram shows a circuit with two batteries and a light bulb. The positive pole of the first battery is connected to the negative pole of the second battery by a wire. The negative pole of the first battery is connected to the light bulb and the positive pole of the second battery is connected to the other side of the light bulb by a wire. ### Question: In which case will the bulb glow? | Option | Answer | |---|---| | A | without any changes to the arrangement shown in the picture. | | B | if the positive terminal of the 1st cell is connected to the negative terminal of the 2nd cell | | C | if the negative terminal of the 1st cell is connected to the positive terminal of the 2nd cell | | D | if the positive terminal of the 1st cell is connected to the negative terminal of the same cell | ## Besides the information given in the picture, what other information is required to find out the direction in which Riyaz is cycling? The photograph shows a man cycling on a road. ### Question: Besides the information given in the picture, what other information is required to find out the direction in which Riyaz is cycling? | Option | Answer | |---|---| | A | the total distance of the race | | B | the time at which he is cycling | | C | the speed at which he is cycling | | D | the place to which he is cycling | ## Amir bought a lamp with a design attached to it that casts a shadow when the lamp is lit, as shown below: The diagram shows a lamp with a small design attached to it. The design looks like a tree silhouette with a bird silhouette on top of the branches. Beside this, the shadow is cast, and it is larger and has a more pronounced bird silhouette. ### Question: He wants to carry out an experiment using this lamp to find out the factors that affect the size of the shadow. The effect of which of the following factors can he actually find out using ONLY this lamp? | Option | Answer | |---|---| | A | distance between the light source and the object | | B | distance between the object and the screen | | C | size of the light source | | D | size of the object | ## Peter has four different wires in his electronic experimental kit. He wants to check if connecting each of them to the open leads of the circuit (shown below) makes the bulb glow or not: The diagram shows a simple electric circuit with a battery, a bulb and two wires. The battery has a positive and negative pole labelled. The wires are connected to the battery at the poles. The two ends on the wires that are not attached have been labelled "Open leads". ### Question: What is the very FIRST thing he should do? | Option | Answer | |---|---| | A | Connect all the wires together to the open leads and check if the bulb glows. | | B | Connect any one of the wires to the open leads and check if the bulb glows. | | C | Connect the open leads of the circuit together and check if the bulb glows. | | D | Connect a plastic piece to the open leads and check if the bulb glows. | ## In the clock shown above, the hands of the clock and the pendulum follow certain types of motion. Which are they? The diagram shows an old fashioned clock with a pendulum swinging. The clock has a second hand, a minute hand and an hour hand. ### Question: In the clock shown above, the hands of the clock and the pendulum follow certain types of motion. Which are they? | Option | Answer | |---|---| | A | 1: Linear; 2: Oscillatory | | B | 1: Linear; 2: Rotational | | C | 1: Rotational; 2: Rotational | | D | 1: Rotational; 2: Oscillatory | ## Syed and Dipti walked from their respective homes to the same school without stopping anywhere. Syed took 15 minutes and Dipti took 10 minutes to reach the school: ### Question: What other information is needed to find out who walked faster to school? | Option | Information | |---|---| | P | the distance between Syed's house and the school | | Q | the distance between Syed's and Dipti's houses | | R | the distance between Dipti's house and the school | ## Shown here is a possible arrangement using a set of four bar magnets: The diagram shows four bar magnets. The top magnet has the north pole labelled N and the south pole labelled S. The magnet below it is labelled with a circle and a triangle. The magnet below that is labelled with a star. The magnet below that is labelled with a circle. The circle on the top magnet is touching the triangle on the second magnet. The triangle on the second magnet is touching the star on the third magnet, and the star on the third magnet is touching the circle on the fourth magnet. ### Question: Based on this, which of the following arrangements is possible using three of these bar magnets? | Option | Arrangement | |---|---| | A | * | | B | | | C | | ## Which of these is a safety procedure that should be followed in a laboratory? | Option | Answer | |---|---| | A | Do not light matchsticks without wearing hand-gloves. | | B | Put on light weight clothes while weighing chemicals. | | C | Do not tie your hair, let them loose during experiments. | | D | Wear proper goggles while heating liquids in test tubes. | ## Manjula separated a mixture of many thermocole balls and copper beads all of the same size as shown below: The diagram shows three beakers. The first beaker contains a mixture of thermocole balls and copper beads, the second beaker contains only thermocole balls and the third beaker contains only copper beads. An arrow is pointing from the first beaker to the second. ### Question: Which of the following could she have done? | Option | Answer | |---|---| | A | added water to the mixture | | B | heated the mixture | | C | used a magnet | | D | used a sieve | ## Rita wanted to check if the MELTING of an ice block causes a reduction in its weight when it becomes water. She placed an ice block in an open container and noted its weight. She weighed the container again when the ice block had completely melted. She found that the weight was LESS than what it was in the beginning ### Question: She concluded that the reduction in weight was due to the melting of the ice block. Is her conclusion correct? | Option | Answer | |---|---| | A | No, because she used only one ice block. | | B | Yes, because there was a reduction in the weight. | | C | No, because she kept the container open during the experiment. | | D | Yes, because the ice block melted completely at the end of the experiment. | ## Abdul uses glasses as a mould to make some candles by pouring molten wax into the glasses and then solidifying it by cooling: The photograph shows three candles in glasses. ### Question: He wants to remove the candles from the glasses. Which of the following should he do before pulling out the candles? | Option | Answer | |---|---| | A | place the glasses in soapy water for a long time | | B | light the candle and let it burn for a little while | | C | place the glasses in hot water for a little while | | D | fill the glasses upto the brim with hot water | ## The amount of water lost due to evaporation in a given time is known as the rate of evaporation. Which of the following substances will reduce the rate of evaporation the MOST when added to 35 mL of water in an open beaker? A diagram shows a beaker with 35mL of water in it. ### Question: Which of the following substances will reduce the rate of evaporation the MOST when added to 35 mL of water in an open beaker? | Option | Answer | |---|---| | A | a teaspoon of oil | | B | a teaspoon of salt | | C | a teaspoon of sand | | D | a teaspoon of honey | ## The mixtures given in the table have been grouped according to the method used to separate their components: The table shows the following: | Method | Mixtures | |---|---| | Method 1 | Salt in water, Sugar in water | | Method 2 | Wooden beads in water, Tea leaves from tea | | Method 3 | Iron filings in water, Sand in water | ### Question: Which of the following mixtures can be separated by ALL the three methods in the table? | Option | Answer | |---|---| | A | oil in water | | B | sugar in milk | | C | honey in water | | D | rice grains in water | ## Some amount of a substance 'X' was placed in Bottle P and Bottle Q. The substance completely filled both the bottles: The diagram shows two bottles. Bottle P is smaller than Bottle Q. ### Question: What are the likely properties of substance 'X'? | Option | Has weight | Has a fixed shape | |---|---|---| | A | No | No | | B | Yes | Yes | | C | No | Yes | | D | Yes | No | ## Merry added water to a mixture of three substances. She then filtered it and threw away the water. At the end of this procedure, she was still left with the same quantity of all the three substances in the mixture: ### Question: What were the three substances present in the mixture? | Option | Answer | |---|---| | A | sugar, iron filings and sand | | B | salt, sugar and