MCQ : Set #8

NOTE : Each set contains 30 questions. Time limit is 45 min.

1. Any motion along a trajectory distinct from a straight line is a motion with...
   
   
   
   1. constant velocity
   2. changing velocity
   3. zero acceleration
   4. changing acceleration
      
   
   
2. An object that has momentum must also have...
   
   
   
   1. acceleration
   2. impulse
   3. kinetic energy
   4. potential energy
      
   
   
3. The dimensions of strain are...
   
   
   
   1. ML^-1T^-2
   2. ML^-1T^-1
   3. M⁰L^-1T^-2
   4. M⁰L⁰T⁰
      
   
   
4. When the velocity of the molecules is zero, the temperature is...
   
   
   
   1. 0°C
   2. 273 K
   3. -273°C
   4. -273 K
      
   
   
5. The potential energy of a charged capacitor(charge=Q, potential difference=V, capacitance=C) is not represented by...
   
   
   
   1. QV/2
   2. CV²/2
   3. Q²/2C
   4. CQ²/2
      
   
   
6. When light passes from vacuum into a medium A, the value of the constant in Snell's law is...
   
   
   
   1. the absolute refractive index of A
   2. the absolute refractive index of vacuum
   3. 1
   4. 0
      
   
   
7. Sun's distance from the earth is equal to...
   
   
   
   1. 1 AU
   2. 2 AU
   3. 14 AU
   4. √ 2 AU
      
   
   
8. For an object performing SHM, phase angle is the quantity represented by...
   
   
   
   1. 2πf
   2. 2πft
   3. 2πfT
   4. 2πf/T
      
   
   
9. The speed needed to put a satellite in orbit does not depend on...
   
   
   
   1. the radius of the orbit
   2. the shape of the orbit
   3. the value of 'g' at the orbit
   4. the mass of the satellite
      
   
   
10. In an adiabatic process, what does not change is...
    
    
    
    1. pressure
    2. volume
    3. temperature
    4. none of the above
       
    
    
11. Inductance is an opposition to...
    
    
    
    1. increasing current
    2. decreasing current
    3. both increasing current and decreasing current
    4. anything but current
       
    
    
12. The voltage lags behind the current by 1/4 cycle in...
    
    
    
    1. a pure capacitor
    2. a pure inductor
    3. a pure resistor
    4. a circuit with capacitance and inductance
       
    
    
13. If the distance between two slits and the distance between the slits and the screen are constant, then the fringe spacing is proportional to...
    
    
    
    1. λ
    2. 1/λ
    3. √λ
    4. 1/√λ
       
    
    
14. If V₀ is the stopping potential, f the frequency of radiation and W₀ is the work function of metal, then (V₀ + W₀) is equal to...
    
    
    
    1. hf
    2. h/e
    3. hf/e
    4. f₀
       
    
    
15. The element whose nuclei contain the most tightly bound nucleons is...
    
    
    
    1. He
    2. C
    3. Fe
    4. U
       
    
    
16. An object weighing 0.10 kg is to be swung in a vertical circle of diameter 0.8 m. The minimum velocity needed would be...
    
    
    
    1. 2.0 m/s
    2. 3.0 m/s
    3. 4.0 m/s
    4. 2√ 5 m/s
       
    
    
17. Light is incident upon a rectangular glass block at the polarizing angle. The fraction of light reflected as plane polarized light will be about...
    
    
    
    1. zero
    2. 10%
    3. 50%
    4. 100%
       
    
    
18. A lead bullet at 300 K is fired with the speed of 300 m/s. If the specific heat capacity of lead is 130 J/(kg K), then upon impact its temperature will reach a maximum value of...
    
    
    
    1. 636 K
    2. 646 K
    3. 666 K
    4. 676 K
       
    
    
19. A particle left no tracks in a cloud chamber, did not register on a Geiger-Muller tube and failed to make a zinc sulphide screen glow. It was most likely...
    
    
    
    1. an electron
    2. a proton
    3. a neutron
    4. an alpha particle
       
    
    
20. A fuse is rated at 10 A. In an A.C. circuit, the maximum instantaneous current it could handle would be about...
    
    
    
    1. 7 A
    2. 10 A
    3. 14 A
    4. 20 A
       
    
    
21. 1 micro curie = ______ Bacqueral
    
    
    
    1. 3.7 x 10¹⁰
    2. 3.7 x 10⁷
    3. 3.7 x 10⁴
    4. 10⁶
       
    
    
22. A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration is given by a_c = k²rt² (k = constant). The power delivered to the particle by the force acting on it is...
    
    
    
    1. 2πmk²r²t
    2. mk²r²t
    3. mk⁴r²t⁵/3
    4. 0
       
    
    
23. A ship of mass 3 x 10⁷ kg initially at rest is pulled by a force of 5 x 10⁴ N through a distance of 3 m. Assuming that the resistance due to water is negligible, the speed of the ship is...
    
    
    
    1. 1.5 m/s
    2. 60 m/s
    3. 0.1 m/s
    4. 5 m/s
       
    
    
24. The buoyancy depends on
    
    
    
    1. the depth to which the body is immersed
    2. the shape of the body
    3. the mass of the body
    4. the mass of the liquid displaced
       
    
    
25. Steam at 100°C is passed into 1.1 kg of water contained in a calorimeter with water equivalent 0.02 kg at 15°C till the temperature of the calorimeter and its content rises to 80°C. The mass of the steam condensed in kg is...
    
    
    
    1. 0.130
    2. 0.065
    3. 0.260
    4. 0.135
       
    
    
26. The sound waves that propagate in a metal bar may be...
    
    
    
    1. longitudinal
    2. transverse
    3. torsional
    4. either longitudinal or transverse
       
    
    
27. The fraction of available volume which is filled in case of hexagonal close-packing structure is...
    
    
    
    1. 0.5
    2. 0.74
    3. 0.32
    4. 0.90
       
    
    
28. A photoelectric cell converts...
    
    
    
    1. electrical energy into light energy
    2. light energy into electrical energy
    3. light energy into sound energy
    4. light energy into heat energy.
       
    
    
29. The sensitiveness of a moving-coil galvanometer can be increased by...
    
    
    
    1. increasing the number of turns of the coil
    2. decreasing the number of turns of the coil
    3. decreasing the area of the coil
    4. none of the above
       
    
    
30. If a star emitting yellow light starts moving towards the earth, its colour as seen from the earth will...
    
    
    
    1. turn gradually red
    2. turn gradually blue
    3. remain yellow
    4. turn bright yellow