# JSTSE : PREVIOUS YEARS

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1 JSTSE : PREVIOUS YEARS (PHYSICS : 2015) 51. Two objects are made to fall freely from heights h 1 and h 2. The ratio of time taken bhy them to reach ground is (Neglect air friction) 1 (b) h 1 / h 2 h 1 h (d) h 2 / h A bullet moving with velocity V penetrates a sand bag upto distance 'x'. Same bullet with velocity '2v' can penetrate bag upto distance. x 3x (b) 2x (d) 4x 53. A stone is tied with a string and a uniform circular motion is developed in the stone. If the string breaks down the stone moves in direction: Radially in ward (b) Radially out ward Tangentially out war (d) Tangentially in ward 54. A ball of mass 20 g is travelling at 10 m/sec. towards a wall. It hits the wall and returns with a speed of 5 m/sec. The change in the momentum of the ball is: 0.1 kg m/sec (b) 1kg m/sec 1kg m/sec (d) 0.1 kg m/sec 55. A ball rolls down from an inclined plane to a horizontal frictionless plane. It will: Stop after 10 seconds (b) Continue to move with uniform acceleration Continue to move forever with uniform velocity (d) Will start moving in a circular path

2 56. Which one of the following is incorrect: JSTSE (Physics 2015) Rate of change of momentum of an object is equal to applied force (b) In action - reaction law both the forces act on different objects The object always moves in the direction of force (d) Momentum in object is the product of mass and is velocity 57. If the planet is revolving around the sun at r distance from the centre of sun with a time period of revolution 'T'. The following remains constant: T/r (b) T 2 r 3 T 2 / r 3 (d) T 3 / r The time period of seconds pendulum on moon will: Increase (b) Decrease Remains constant (d) Cannot say 59. A piece of ice is floating in a vessel filled with water when ice melts, the level of water in vessel: Decrease (b) Increase Remains same (d) 1st decreases then increases 60. The amplitude of sound wave is reduced to one third and frequency is doubled. The intensity of sound wave at same point will be: Increase by a factor of 9/4 (b) Decrease by a factor of 9/4 Increase by a factor of 4/9 (d) Decrease by a factor of 4/9 61. 'Ultra sonography' is based on: (e) Reflection of sound (b) Transmission of sound Reflection and refraction of sound (d) Reflection and refraction of sound (e) Reflection and transmission of sound 62. Rare-fractions are the points where: Pressure is low and extension is high (b) Pressure is high and extension is low Pressure and extension both high (d) Pressure and extension both low

3 63. Power of an engine is 19.6 kw. The capacity of water it can lift up per sec. from a well of 40 m depth is: (b) 48 kg 52 kg (b) 50 kg (d) 54 kg 64. The correct relation between kwh and joule is: 3.6 l0 10 J J (b) J (d) 3.6 l0 5 J 65. Which of the following correctly represents the energy-displacement relationship for a spring-mass system: 66. The defect of human eye in which far off objects cannot be seen clearly can be corrected by using: (b) Concave mirror Convex lens 67. The stars in the sky appear twinkling due to: Reflection of light Atmospheric refraction (b) Concave lens (d) Convex mirror (b) Atmospheric diffraction (d) None of the above 68. Light of m / sec. falls on a glass prism. The frequency of light is Hz. What will be its frequency after passing through glass prism: Hz (b) 10 5 Hz Hz (d) None of the above

4 69. A car is running between two points P and Q. If it travels half of the distance between P and Q with velocity 40 km/hr. and other half with 60 km/hr. and return in the same manner. The average speed of the car is: 50 km/hr 100 km/hr 70. In the given (v-t) graph: (b) 52 km/hr (d) 48 km/hr The displacement of the body in 6 seconds is: 45 m 15 m (b) 90 m (d) 6 m 71. Acceleration in a particle moving in uniform circular motion is due to: Change in velocity Acceleration is zero 72. SI unit of Inpulse is: (b) kg m / sec2 (b) Change in speed (d) Change in speed as well as direction (b) kg m / sec Kg sec / m (d) Newton - meter (Nm) 73. A body of mass 20 kg is moving under force of 10 N. The value of inertia of the body is: 5 kg (b) 0.2 kg 20 kg (d) 100 kg 74. A body immersed in a liquid shows loss in weight due to: Frictional force between liquid and the body (b) Gravitational force Columbian force (d) Buoyant force

5 75. What will be the mass of the object on moon whose weight is 180 N on the earth: 30 kg 18 kg (b) 10 kg (d) 180 kg 76. Value of 'g' does not depend on: Rotation of earth about its axis (b) Height above the earth / distance below the earth Radius of earth at poles and at equator (d) Revolution of earth around sun 77. Weightlessness is a condition in which: Mass of body becomes zero (b) Weight of body becomes zero Mass and weight both becomes zero (d) Neither mass nor weight becomes zero (b) 78. Which of the graphs represents high pitch sound: 79. The given figure shows the shape of a part of long string in which transverse waves are produced. Which pairs of particles are in phase: 2 and 5 2 and 3 (b) 5 and 7 (d) 4 and 5

6 80. Which of the following characteristics of sound changes by loudspeaker: Amplitude Velocity (b) Frequency (d) Wavelength 81. When 10 N force is applied on a moving body, it travels 50 m before coming to rest. The work done is: 500 N sec (b) 500 Joule 500 Joule (d) 250 Joule 82. When a spring is compressed the work done during compression is stored in the spring in the form of: Gravitational energy (b) Elastic potential energy Elastic kinetic energy (d) Frictional energy (b) 83. In the following diagram the positions of Pendulum are indicated. In which position it has maximum potential energy: A,D C, B 84. Match-2 means: (b) D, C (d) A, B Mechanics of 2 nd generation (b) Velocity of twice of velocity of light Way of representation of technology of aero planes (d) Velocity twice of velocity of sound 85. Quality of musical sound depends upon: Frequency Overtones (b) Amplitude (d) None of these

7 86. Work done by gravitational force depends upon: Initial and final positions of object (b) Length of the path between two points Density of the object (d) Size of the object JSTSE (Physics 2015) 87. The distance between two consecutive crests is given by: (b) 2 /2 (d) In which situation will maximum pressure is exerted on the floor by the given object: A (b) B C (d) All will exert same pressure 89. Which of the following represents graph for zero acceleration: (iii) and (iv) (b) (i) and (iii) (i) and (ii) (d) (ii) and (iv) 90. The density of the liquids is determined by: Lactometer (b) Barometer Hydrometer (d) None of these

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