Test Your Knowledge - PHYSICS MCQ PRACTICE
by Saksham Chaudhry : Lancers Convent, Prashant Vihar, New Delhi 110085
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A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.
For each of the following multiple choice questions, choose the most appropriate answer :

1. A body of mass 0.4 kg is whirled in a vertical circle making 2 rev/sec. If the radius of-the circle is 1.2 m, then tension in the string when the body is at the top of the circle, is
A. 41.56N 
B. 89.86N 
C. 109.86N 
D. 115.86N 

2. To use a transistor as an amplifier
A. Emitter-base junction is forward biased and collector-base junction is reversed biase 
B. both junctions are reverse biased 
C. both junctions are forward biased 
D. It does not matter how the transistor is biased, it always works as an amplifier 

3. If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25 cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is
A. 400 
B. 250 
C. 200 
D. 150 

4. A boat carrying a number of large stones is floating in a water tank. What will happen to the water level if the stones are unloaded into the water ? The water level
A. rises 
B. falls 
C. remains unchanged 
D. rises till half the number of stones are unloaded and then begins to fall 

5. When an electron positron pair annihilates, the energy released is about
A. 0.8E-13 J 
B. 1.6E-13 
C. 3.2E-13 J 
D. 4.8E-13 J 

6. A light signal photon cannot escape from the surface of a
A. neutron star 
B. black hole 
C. red giant 
D. white dwarf 

7. ln a nuclear reactor
A. the thick concrete shield is used to slow down the speed of neutrons 
B. heavy water or graphite is used to moderate the activity of the reactor 
C. the chain reaction is controlled by rods of uranium whose going in reduces the rate 
D. out of U238 and U235, the natural uranium has less than 1 % of dU 235 

8. The angle between two vectors of magnitude 12 and 18 units when their resultant is 24 units,is ?
A. 6351' 
B. 8231 
C. 7552' 
D. 8916 

9. Sodium lamps are used in foggy conditions because
A. Yellow light is scattered less by the fog particles 
B. Yellow light is scattered more by the fog particles 
C. Yellow light is unaffected during its pamsage through the fog 
D. Wavelength of yellow light is the mean of the visible part of the spectrum 

10. An electric fan has blades of length 30 cm measured from the axis of rotation. If the fan is rotating at 120 rpm, the acceleration of a point on the tip of the blade is ?
A. 1600 m/s/s 
B. 47.4 m/s/s 
C. 23.7 m/s/s 
D. 50.55 m/s/s 

11. When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is
A. Polarized 
B. Of longer wavelength 
C. Of shorter wavelength 
D. Of high intensity 

12. If the radius of the earth shrinks by 1.5% mass remaining same , then the value of acceleration due to gravity changes by
A. 1% 
B. 3% 
C. 4% 
D. 2% 

13. A body of mass 0.5 kg is whirled in a vertical circle at an angular frequency of 10 rad/s. lf the radius of the circle is 0.5 m, what is the tension in the string when the body is at the top of the circle ? Take g = l0 m/s2
A. 40N 
B. 30N 
C. 20N 
D. 10N 

14. When a guitar string is surrounded with a 440 Hz tuning fork, a beat frequency of 5 Hz is heard. It the experiment is repeated with a tuning fork of 437 Hz, the beat frequency is 8 Hz. The string frequency is
A. 445 Hz 
B. 435 Hz 
C. 429 Hz 
D. 448 Hz 

15. A concrete sphere of radius R has a cavity of radius r which is packed with sawdust. The relative densities of concrete and sawdust are 2.4 and 0.3 respectively. For this sphere to float with its entire volume submerged under water, the ratio of the mass of concrete to the mass of sawdust will be
A. zero 
B. 3 
C. 4 
D. 8 

16. Which of the statements below is courect ?
A. The angle of bank for a road is obtained from a consideration of the centripetal force required 
B. There is no tendency for the vehicle to skid if a road is banked for the speed at which the vehicle is moving 
C. C. The resultant force action on the vehicle will be that which maintains it in the circular path 
D. All of the above statements are correct 

17. In case of linearly polarized light, the magnitude of the electric field vector
A. increases and decreases linearly with time 
B. is parallel to the direction of propagation 
C. does not change with time 
D. varies periodically with time 

18. In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons . This process forms the basis of an important diagnostic procedure called
A. MRI 
B. PET 
C. CAT 
D. SPECT 

19. The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to
A. h1/2 
B. h 
C. h3/2 
D. h2 

20. A neutron makes a head on elastic collision with a stationary deuteron. The fractional energy loss of the neutron in the collision is
A. 16/81 
B. 8/9 
C. 8/27 
D. 2/3 

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