Test Your Knowledge - Free MCQ PRACTICE
by Saksham Chaudhry : Paschim Vihar, New Delhi 110063 T: 1142316457, 9810570740
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. Two spheres of same size, one of mass 2 Kg and another of mass 4 Kg, In dropped simultaneously lrorn the top of Qutab Miner height = 72 m. When they are 1 m above the gonad. the two spheres have the same
A. Momentum 
B. Kinetic energy 
C. Potential energy 
D. Acceleration 

2. Calculate the work done , it a wire is loaded by Mg weight and the increase in length is l
A. Mgl/2 
B. 2 Mgl 
C. Mgl 
D. Zero 

3. A laser beam is used for carrying out surgery because it
A. Ls highly directional 
B. Can be sharply focused 
C. Ls highly coherent 
D. Ls highly monochromatic 

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

5. A metal rod of length I. is clamped at a distance L/4 from one end. it is set into longitudinal vibrations by pulling on length-wise with a resin cover cloth piece. 'lhe wavelength for fundamental mode of vibration will be
A. L/4 
B. 3L/4 
C. L 
D. L/2 

6. Which statement is false ?
A. In a perfect gas, there is no force of attraction among the molecules 
B. The RMS velocity of the gas molecules is proportional to its absolute temperature 
C. The RMS velocity of the gas molecules is inversely proportional to the square root of the molecular weight 
D. The gas pressure per unit volume is 2/3 of the mean kinetic energy 

7. A person suffering from hypermetropia requires which type of spectacle lenses
A. Convex lens 
B. Convex-concave lens 
C. Plano-concave lens 
D. Concave lens 

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

9. In an orbital motion. the angular momentum vector is
A. Ln the orbital plane 
B. Along the radius vector 
C. Parallel to the linear momentum 
D. Perpendicular to the orbital plane 

10. A beam of 35.0 keV electrones strikes a molybdenum target, generating the X-rays. What is the cutoff wavelength?
A. 35.5 pm 
B. 40.0 pm 
C. 15.95 pm 
D. 18.2 pm 

11. The resistance of an ammeter is 13 ohms and its scale is graduated for a current upto 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 A with this meter. The value of shunt resistance is
A. 20 ohms 
B. 2 ohms 
C. 0.2 ohms 
D. 2k ohms 

12. The velocity with which a projectile must be fired so that it escapes earth's gravitation does not depend on
A. Gravitational constant 
B. Radius of the projectile's orbit 
C. Mass of the projectile 
D. Mass of the earth A 

13. Which of the following relations between weber, second, ampere and volt is correct ?
A. Weber/second = volt 
B. Weber/second = ampere 
C. Weber x second = volt 
D. Weber x second = ampere 

14. The direction of the force exerted on a surface by a liquid at rest is
A. Tangential to the surface 
B. Parallel to the surface 
C. 30 to the surface 
D. Normal to the surface 

15. You are standing 1000 m from the point where a steel block strlkes the sldewalk. How long will lt take the sound to reach your ears if the speed of sound in air at 0 C is about 333 m/sec. ?
A. 3 seconds 
B. 2 seconds 
C. 1 second 
D. 5 seconds 

16. Characteristic X-rays are produced due to
A. Transfer of energy in collision of electrons with atoms in the target 
B. Transfer of momentum in collision of electrons with target atoms 
C. Heating of the target 
D. Transition of electrons from higher to lower electronic orbits in an atom 

17. Liquid oxygen remains suspended between two pole faces of a magnet because lt is
A. Diamagnetic 
B. Paramagnetic 
C. Ferromagnetic 
D. Antiferromagnetic 

18. Two wires A and B of the same material have their lengths in the ratio of I : 2 and their diameters in the ratio of 2 : 1. lf they are stretched with the same force, the ratio of the increase in the length of A to that of B will be
A. 1 : 4 
B. 1 : 8 
C. 4 : 1 
D. 1 : 2 

19. Two metallic charged spheres whose radii are 20 cm and 10 cm respectively, have each 150 micro-coulomb positive charge. The common potential after they are connected by a conducting wire is
A. 13.5E6 volts 
B. 1.8E6 volts 
C. 4.5E7 volts 
D. 9E6 volts 

20. What is the velocity of wave in monatomic gas having pressure 1 kilo pascal and density 2.6 kg/m3
A. 8900 m/s 
B. 3.6 m/s 
C. Zero 
D. None of these 

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