# NEW HORIZON SCHOOL WORKSHEETS TERM 2 SESSION [CLASS 9] Physics

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1 Physics GRAVITATION 1. Pascal is a unit of a) pressure b) force c) linear momentum d) energy 2. The buoyant force on a body acts in a a) vertically downward direction b) vertically upward direction c) horizontal direction d) direction between the horizontal and the vertical 3. The force acting normally on a surface is called a) pressure b) Thrust c) Force d) Balanced Section B 1. Define pressure at a point. 2. State Archimedes principle. 3. Why is it easier to swim in sea water than in fresh water? 4. Does a liquid press an immersed body from all sides? 1. A body of volume 50 cm3 is completely immersed in water. Find the force of buoyancy on it. 2. A block weighing 1 kg is in the shape of a cube of length 10 cm. It is kept on a horizontal table. Find the pressure on the portion of the table where the block is kept. 3. A bottle weighs 30 g when empty, 53.4 g when filled with a liquid and 48 g when filled with water. Calculate the density of the liquid. Given, density of water at 40C = 1000 kg/m3. 4. A metallic sphere of radius 2.0 cm is completely dipped in water. Find the force of buoyancy on it. 5. A cubical block of copper is dipped completely in water. Each edge of the block is 1cm in length. Find the buoyant force acting on the cube.

2 Chapter: Work and Energy Section A 1. Newton metre is the unit of a) Power b) Work c) Momentum d) Gravitational Intensity 2. A body is moved through a distance of 3 m in the following different ways. In which case is the maximum work done? a) When pushed over an inclined plane b) When lifted vertically upward c) When pushed over smooth rollers d) When pushed on a plane horizontal surface. 3. No work is done when a) a donkey is carrying a load on its back b) on engine is pulling a train c) a sail boat is moving due to wind energy d) a wind mill is lifting water from a well. 4. What is the work done by a boy in pushing a book with a force of 5 N and displacing it through 20 cm along the push? a) 1J b) 2J c) 1.5 J d) 3J 5. The kinetic energy of a body depends a) on its mass only b) on its speed only c) on its mass as well as on its speed d) neither on its mass nor on its speed. 6. A body of mass 10 kg is dropped from a height of 2m. If g is taken to be 10 m/s2, the kinetic energy of the body just before striking the ground will be a) 400J b) 4J c) 40J d) none 7. A ball is thrown upwards from a point A. it reaches up to the highest point B and returns at the same point. Which of the following statement is correct a) Kinetic energy at A = kinetic energy at B b) Potential energy at A = potential energy at B c) Potential energy at B = kinetic energy at B d) Potential energy at B = kinetic energy at A 8. When the speed of a particle is doubled, its kinetic energy a) remains the same b) gets doubled c) becomes half d) becomes 4 times. 9. When the speed of a body is doubled, the ratio of kinetic energy to its momentum. a) gets doubled b) remains the same c) becomes half d) becomes 4 times. 10. Two bodies of unequal masses are dropped from a cliff. At any instant, they have equal a) momentum b) acceleration c) kinetic energy d) potential energy.

3 11. A body is dropped form a certain height above the ground when it is half way down, it possesses a) Only kinetic energy b) Only potential energy c) Both kinetic and potential d) no energy at all energy 12. A flying aeroplane possesses a) Only P.E. b) Only K. E. c) both potential and kinetic energy d) Neither potential nor kinetic energy. 13. In which of the following cases is the potential energy of a spring minimum? a. When it is compressed b. When it is extended c. When it is at its natural length d. When it is at its natural length but kept at a height above ground. 14. When a body roller down an inclined plane, a) Only K.E b) only P.E c) both K.E and P.E d) neither K.E. nor P.E. 15. kwh is unit of.a) Power b) momentum c) impulse d) energy 16. The unit of power is a) Watt b) joule c) Newton d) kg 17. No. of joules in kwh is a) b) c) d) Section B 1. Define work. Is it scalar or vector quantity? 2. What is the condition for a force to do work on a body? 3. A man is rowing a boat upstream, but his boat remains at rest with respect to the shore. Is he doing any work? 4. Give an example where the displacement of a particle is in the direction opposite to force acting on this particle. 5. What happens to the work done when the displacement of a body is at right angles to the direction of force acting on it? Explain your answer. 6. A ball of mass 1 kg thrown upwards, reaches a maximum height of 5 m. Calculate the work done by the force of gravity during this vertical displacement. 7. A person pulls a body on a horizontal surface by applying a force of 5 N at an angle of 30º with the horizontal. Find the work done by this force in displacing the body through 2 m. (cos 30º = 3/2) 8. A horizontal force of 50 N displaces on object of mass 100 kg. Calculate the distance moved and work done by the force in 8 seconds. 9. A car of mass 2500 kg travelling at a speed of 40 m/s stops after covering a distance of 50 m when brakes are applied. Calculate (a) the force exerted on it by the brakes (b) work done by brakes. 10. Differentiate between work, power and energy. Also state their S.I. units. 11. Define kinetic energy. Give one example also. 12. By what factor does the kinetic energy of a particle of mass m increase if the speed is increased by factor of 3? 13. Does the kinetic energy of a body depend on its direction of motion? 14. By how much will the kinetic energy of a body increase if Speed is doubled ii) Speed is halved.

4 15. Deduce the formula of kinetic energy of a body moving with velocity, v 16. A ball of mass 0.5 kg slows down from a speed of 5m/s to that of 3m/s. Calculate change in kinetic energy of the ball. 17. A block is thrown upwards with a K.E. of 2J. If it goes up to a maximum height of 2m, find the mass of the block. 18. The mass of a ball A is double the mass of Ball B. The ball A moves at half the speed of ball B. Calculate the ratio of K.E. of A to K. E. of B. 19. A body A of mass 3 kg and body B of mass 2 kg are dropped simultaneously from a height of 14.9 m. Calculate ratio of the kinetic energy when they just touches the earth 20. Differentiate between work, power and energy. Also state their SI units. 21. Define potential energy. Give one example. 22. Which of the following are examples of potential energy? a) A boy at the top of a slide b) a stretched catapult c) a hot iron d) a stretched bow heir momenta e) their kinetic energies e) the arrow in stretched bow 23. State the principle of conservation of energy. 24. A ball is dropped from a height H. When it reached the ground, its velocity is 50 m/s. Find height H. 25. A body of mass 100 kg is lifted up by 10 m. Find Amount of work done,potential energy of the body at that height (value of g = 10 m/s2) 26. A boy weighing 40 kg carries a box weighing 20 kg to the top of building 15 m high in 25 sec. Calculate the power. (g = 10 m/s2) 27. Two persons do the same amount of work in 10s and 20 s respectively. What is the ratio of the power used by first person to that by second person? 28. Calculate the power developed by a 110 kg mass climbing up a vertical staircase at the rate of 2m/s. (g= 9.8 m/s2) H.O.T.S. Questions 29. A lorry and a car moving with same kinetic energy are brought to rest by application of brakes which provide equal retarding forces. Which one

5 Chapter: Sound Section A 1. Sound is a type of a) Energy b) force c) charge d) matter of them will come to rest in a shorter distance? 2. Sound waves can travel through a) Gases only b) vacuum only c) gases and liquids only d) Solids, liquids and gases. 3. Sound waves are a) longitudinal b) transverse c) both a) & (b) d) None of the above 4. Sound waves can be a) Reflected b) Absorbed c) Diffracted d) All of the above 5. Speed of sound waves in water is about a) 332 m/s b) 1440 m/s c) 5000 m/s d) m/s 6. Speed of sound in ordinary air a) is less than Carbon dioxide b) greater than CO2 c) equal to CO2 d) None of these 7. In which of the following mediums will sound travel fastest a) liquid b) solid c) gas d) vacuum. 8. Hertz is a unit of a) frequency b) wave speed c) displacement d) wavelength 9. The upper frequency limit of the audible range of human hearing is about a) 20 KHz b) 2000 Hz c) 2 KHz d) Hz 10. Ultrasonic waves have frequencies a) below 20 Hz b) between 20 Hz and Hz c) above Hz d) no lower or upper limit of frequency. 11. Infrasonic waves have frequencies a) below 20 Hz b) between 20 Hz and Hz

6 c) above Hz d) no upper or lower limit of frequencies 12. Ultrasound is an application of a) infrasonic waves b) ultrasonic waves c) sound waves d) light waves 13. In order to hear an echo, time gap between original sound and reflected sound is a) equal to 1/10 and b) greater than 1/10 and c) both (a) and (b) d) none of the above 14. The properties of ultrasound that make it useful are: a) high power and high speed b) Good directionality and high power c) High speed and frequency d) Good directionality and ability to move around objects. Section B 1. What type of waves are produced in air when a bell rings? 2. How does sound from a sound producing body travel through air to reach our ears? 3. When we open a gas tap for a few seconds, the sound of escaping gas is heard first but smell of gas comes later why? 4. Describe an experiment to show that sound is not transmitted through vacuum. 5. Define the following terms a) echo b) amplitude c) wavelength d) frequency e) pitch f) loudness g) time period 6. Distinguish between echo and reverberation. 7. A stone is dropped from the top of a tower 300m high splashes into water of a pond near the base of the tower. When is splash heard at the top? Given, Speed of sound in air = 340 m/s and g = 9.8 m/s2 8. If 5 seconds elapse between a lightning flash and the clap of thunder how far away is the storm? Speed of sound in air = 332 m/s 9.A person makes a loud sound and hears the echo of this sound 1.2 s later. Calculate how far the person is from the object causing the echo. Assume speed of sound is 332 m/s 10. Describe the relation between velocity, wavelength and frequency? 11. What is the difference between the terms ultrasonic and supersonic? 12. Name an animal which navigates and finds food by echo location. 13. How are bats able to fly at night without colliding with other objects 14. Name the principle on which a megaphone works? Explain that principle. 15. Give various uses of ultrasound. 16. Given below is the structure of ear. Label its various parts. 17. A bat emits ultrasonic sound of frequency 100 KHz in air. If this sound meets a water surface, what is the wavelength of (a) The reflected sound (b) transmitted sound? (Speed of Sound in air = 340 m/s) 18. A hospital uses an ultrasonic scanner to locate tumours in a tissue what is the wavelength of sound in a tissue in which speed of sound is 1.7 km/s? The operating frequency of scanner is 4.2 MHz. 19. A tuning fork makes 284 vibrations per second in air. Compute the wavelength of the tone emitted. Given speed of sound = 330 m/s. H.O.T.S. Questions

7 Q.1 After the snow fall, why does it seem particularly quite? Q.2 Why do empty rooms sound hollow? Q.3 Which travels faster: a radio signal or sound in air? Q.4 A child watching Dussehra celebrations from a distance sees the effigy of Ravana burst into flames and hears the explosion associated with it 2 s after that. How far was he from the effigy of the speed of sound in air that night was 335 m/s.

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