Test Your Knowledge - Free MCQ PRACTICE
by Saksham Chaudhry : 23-B Model Town, Fatehabad 125050 M: 9810570740, 9810571993
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. An object is immersed in a fluid. ln order that the object becomes invisible, it should
A. Behave as a perfect reflector
B. Absorb all light falling on its surface
C. Have refractive index 1.0
D. Have refractive index exactly matching with that of the surrounding fluid

2. In which case there is maximum tension in the wire, if same force is applied on each wire
A. L = 400 cm, d = 0.01 mm
B. L = 300 cm. d = 0.03 mm
C. L = 200 cm, d = 0.02 mm
D. L = 500 cm, d = 0.05 mm

3. 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

4. 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

5. When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon of
A. Interference
B. polarization
C. diffraction
D. dispersion

6. A proton is about 1840 times heavier than an electron . When it is accelerated by potential difference of 1 kV, its kinetic energy will be
A. 1840 ke V
B. 1./1840 ke V
C. 1 ke V
D. 920 ke V

7. The amount of a liquid’s cohesive force per unit of length is called
A. depression
B. adhesion
C. apparent weight
D. surface tension

8. The wavelength of light of a particular wavelength received from a galaxy is measured one earth and is found to be 5% more that its wavelength. It follows that the galaxy is
A. going away from the earth with a speed 1.5E7/ms
B. approaching the earth with a speed 1.5E7/ms
C. going away from the earth with a speed 3E7/ms
D. approaching the earth with a speed 3E7/ms

9. 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

10. A proton and an alpha - particle, moving with the same velocity. enter into a uniform magnetic field, acting normal to the plane of their motion. The ratio of the radii of the circular paths described by the proton and alpha - particle is
A. 1:2
B. 1:4
C. 1:16
D. 4:1

11. 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

12. If Alpha, Beta and Gamma rays carry same momentum. which has the longest wavelength ?
A. Alpha rays
B. Beta rays
C. Gamma rays
D. None, all have same wavelength

13. The Magnetic Resonance Imaging MRI is based on the phenomenon of
A. Nuclear magnetic resonance
B. Bectron spin resonance
C. Electron paramagnetic resonance
D. Diamagnetism of human tissues

14. We wish to see inside an atom, Assuming the atom to have a diameter of 100 pm, this means that one must be able to resolve a width of say 10 pm. If an electron microscope is used, the minimum electron energy required is about
A. 1.5 keV
B. 15 keV
C. 150 keV
D. 1.5 MeV

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

16. A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a
A. concave mirror of focal length 10 cm
B. concave mirror of focal length 60 cm
C. concave mirror of focal length 40 cm
D. convex mirror of focal length 10 cm

17. A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 micrometer and refractive index 1.5 is introduced in the path of the upper beam. The location of the central maximum will
A. Remain unshifted
B. Shift downward by nearly two fringes
C. Shift upwards by nearly two fringes
D. Shift downward by 10 fringes

18. If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same
A. Energy
B. Momentum
C. Velocity
D. Angular momentum

19. If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same
A. Energy
B. Momentum
C. Velocity
D. Angular momentum

20. 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

Global Book Shop
23-B Model Town, Fatehabad 125050 M: 9810570740, 9810571993
Tel: 01142316457, 9810571993 facebook.com/doctorkc