9th Grade Exam: Important Questions

• There are 49 compulsory questions in the question paper.
• Questions 1-35 are multiple choice and worth 1 mark each.
• Questions 36-44 are short answer type (i) and carry 2 marks each.
• Questions 45-47 are short answer type (ii) and carry 3 marks each.
• Questions 48-49 are long answer questions and carry 4 marks each.
• Internal choice is provided in some questions.

Multiple Choice Questions Summary:

• Ammonium chloride readily sublimes on heating.
• The rate of evaporation increases with a decrease in humidity.
• A solid melts at 52°C, which is equal to 325 K on the Kelvin scale.
• Water in an earthen pot cools during summer due to evaporation.
• Tincture of iodine, an antiseptic, is made by dissolving iodine in alcohol.
• Germanium is an element with properties intermediate between metals and non-metals.
• A liquid has a fixed volume but not a fixed shape
• A solution with 5 g of sugar in 45 g of water has a concentration of 10% by mass.
• Centrifugation is used to separate cream from milk.
• Lysosomes digest damaged cells.
• Prokaryotic cells lack membrane-bound cell organelles.
• Smooth endoplasmic reticulum in liver cells plays a crucial role in detoxification.
• Mitochondria is a cell organelle, other than the nucleus, containing its own DNA.
• Cardiac muscle functions without fatigue throughout an individual's life.
• Tracheids are the primary water-conducting tissues in gymnosperms.
• Parenchyma cells are living, thin-walled, and loosely packed.
• In the Velocity vs. Time graph provided, the body is moving at a constant velocity
• A bus traveling at 20 ms⁻¹ with a deceleration of 5 ms⁻² will come to rest in 4 s.
• In the Distance vs. Time graph, Speed of A > Speed of B
• A train with a length of 100 m passes over a 200 m bridge in 10 s, the speed of the train is 30 ms⁻¹.
• When the net force on a body is zero, the forces are called balanced forces.
• An object of mass 2 kg moving with a constant velocity of 20 ms⁻¹ has an unbalanced force of 0 N acting on it.
• The value of 'G' in the universal law of gravitation depends on mass and radius of the earth.
• A force of 1 Newton produces an acceleration of 1 ms⁻² on an object of mass 1 kg.
• The value of acceleration due to gravity is least at the equator.
• If gravitational attraction becomes zero, the weight of the body becomes zero, while the mass remains unchanged.
• An object weighing 600 N on earth will weigh 100 N on the moon, where gravity is 1/6th of earth's.
• A body immersed in a fluid experiences an upward force equal to the weight of the fluid displaced by it.
• If the masses of two objects are halved, and the distance remains constant, the gravitational force becomes F/4.
• Apis mellifera is used in apiaries because they have high honey collection capacity.
• Crop rotation involves growing different crops in a pre-planned succession.
• A major problem affecting composite fish culture is the lack of availability of good quality fish seeds.
• The correct statements about genetics are: (i) hybridization means crossing between genetically dissimilar plants, and (iii) introducing genes of desired characters into a plant gives a genetically modified crop.
• Indian cattle include Bos indicus and Bos bubalis.