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. How far will a body free-fall in 1 second if released from rest ?
A. 0.0m
B. 4.9m
C. 9.8 m
D. 19.6 m
2. In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum
A. Wavelength
B. Frequency
C. Amplitude
D. Angle of incidence
3. The specific charge of an electron is
A. 5.7E7 Coulomb/kg
B. 1.76E11 Coulomb/kg
C. 1.6E-19 Coulomb/gm
D. 1.6E-19 Coulomb
4. 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
5. A light signal photon cannot escape from the surface of a
A. neutron star
B. black hole
C. red giant
D. white dwarf
6. 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
7. The angle between two vectors of magnitude 12 and 18 units when their resultant is 24 units,is ?
A. 63°51'
B. 82°31’
C. 75°52'
D. 89°16’
8. 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
9. A beam of electrons passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off and the same magnetic field is maintained. the electrons move
A. in an elliptical orbit
B. in a circular orbit
C. along a parabolic path
D. along a straight line
10. 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
11. In isothermal expansion, the pressure is determined by
A. Compressibility only
B. Temperature only
C. Both temperature and compressibility
D. None of these
12. The ratio of energy of emitted radiation of black body at 27°C and 927°C is
A. 1:256
B. 1:64
C. 1:16
D. 1:4
13. Two rods of the same length and material transfer a given amount of heat in 12 seconds when they are joined end to end. But when they are joined length-wise, they will transfer the same amount of heat, in the same conditions, in
A. 1.5s
B. 48s
C. 24s
D. 3s
14. A capillary tube or radius r is immersed in water and water rises in it to a height. The mass of water in the capillary tube is 5g. Another capillary tube of radius 2r is immersed in water . The mass of water that will rise in this tube is
A. 10 g
B. 20 g
C. 5.0 g
D. 2.5 g
15. The waves produced by a motorboat sailing in water are
A. Transverse
B. Longitudinal
C. Longitudinal and transverse
D. Stationary
16. 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
17. A parallel plate capacitor is made by stacking n equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is C then the resultant capacitance is
A. n-1C
B. n+1C
C. C
D. nC
18. A diatomic gas initially at 18°C is compressed adiabtically to 1/8 of its original volume. The temperature after compression will be
A. 144°C
B. 891°C
C. 887°C
D. 18°C
19. Two forces of 45 kg-f and 40 kg-f act on a body in opposite directions. What is the resultant force ?
A. 45 kg-f
B. 40 kg-f
C. 5 kg-f
D. 90 kg-f
20. 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%
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