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Questions and Answers
Why are stringed instruments like guitars provided with a hollow box?
Why are stringed instruments like guitars provided with a hollow box?
Which substance is a good conductor of heat if its specific heat capacity is 3.6 J/g K?
Which substance is a good conductor of heat if its specific heat capacity is 3.6 J/g K?
What is the relationship between thermal capacity and specific heat capacity?
What is the relationship between thermal capacity and specific heat capacity?
In a calorimeter, 250g of water at 300°C is mixed with a metal at 750°C. What happens to the temperature of the water and metal?
In a calorimeter, 250g of water at 300°C is mixed with a metal at 750°C. What happens to the temperature of the water and metal?
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Two resistors are connected in parallel to a cell. What is the advantage of this arrangement?
Two resistors are connected in parallel to a cell. What is the advantage of this arrangement?
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A copper wire has a high electrical conductivity. What is the reason for this?
A copper wire has a high electrical conductivity. What is the reason for this?
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Why is copper not suitable as a fuse wire?
Why is copper not suitable as a fuse wire?
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What is the atomic number of the element 𝑍𝑆 after emitting 2α and 1β particles?
What is the atomic number of the element 𝑍𝑆 after emitting 2α and 1β particles?
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Which type of radioactive radiation has the least penetrating power?
Which type of radioactive radiation has the least penetrating power?
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What is the main precaution to handle radioactive substances?
What is the main precaution to handle radioactive substances?
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Study Notes
Physics Class 10 Half-Yearly Examination
SECTION 1
- Ohm's law can be verified using a circuit diagram
- When an atom emits an alpha and beta particle, the number of protons and neutrons in the resulting element can be calculated
- A knife is a type of second-class lever
- The principle of calorimetry is a scientific principle used to measure heat transfer
- Terminal p.d and e.m.f of a cell are two different concepts in physics
Physics Concepts
- Workdone on an object can be calculated using the formula: Work = Force x Distance
- Resistance of a conductor is related to its mass per unit length and density
- Energy changes occur in photovoltaic cells and electromagnets when in use
- Temperature differences occur between the top and bottom of a water fall due to thermal equilibrium
- Electrical gadgets in houses are connected in parallel for safety reasons
Physics in Daily Life
- A boy's weight on the moon is different from his weight on earth due to gravity
- The unit of work is the same as the unit of energy
- The energy changes in a system occur due to the interaction between the system and its surroundings
- The temperature of water at the bottom of a water fall is different from the temperature at the top due to thermal equilibrium
SECTION 2
Energy and Work
- Energy is conserved in a freely falling body
- The weight of an object can be calculated using its mass and gravity
- A block and tackle system can be used to lift heavy loads with less effort
- The velocity ratio of a pulley system is 5, which means the effort required to lift a load is reduced by 5 times
Light and Optics
- The power of a lens is defined as the reciprocal of its focal length
- A concave lens can form an erect and magnified image of an object
- The angle of incidence is equal to the angle of reflection in a mirror
- The magnification of an image can be calculated using the formula: Magnification = -di/do
Electromagnetic Waves
- Electromagnetic waves have wavelength and frequency
- The speed of electromagnetic waves in vacuum is 3 x 10^8 m/s
- X-rays have a wavelength of 50 A° and are used in medical imaging
- Radar signals can be used to detect objects at a distance
Thermal Properties
- Specific heat capacity is the amount of heat required to raise the temperature of 1 kg of a substance by 1°C
- Thermal capacity is the product of specific heat capacity and mass of a substance
- Latent heat of fusion is the amount of heat required to change the state of a substance from solid to liquid
- Copper is a good conductor of heat due to its high specific heat capacity
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Description
This quiz is from a Class 10 Physics half-yearly exam, covering topics such as circuits, Ohm's law, and levers.
