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. lf the density of a given body is 10 gm/cms, what is its specific gravity ?
A. 0.01
B. 1.0
C. 1.0
D. 10.0
2. 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
3. A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy will be
A. 1840 keV
B. 1/1840 keV
C. 1 keV
D. 920 keV
4. For a wave propagating in a medium, identify the property that is independent of the others
A. Velocity
B. Wavelength
C. Frequency
D. None. All these are interdependant
5. Blue colour of sky is due to
A. Interference
B. Scattering of light
C. Dispersion of light
D. Sun emits more of blue
6. Bermoulli's equation is a consequence of conservation of
A. Energy
B. Linear momentum
C. Angular momentum
D. Mass
7. 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
8. A bullet is fired from a gun with a speed of 1000 m/s in order to hit a target 100 m away. At what height above the target should the gun be aimed? The resistance of air is negligible and g=10 m/s2
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm
9. A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
A. 11RT
B. 9RT
C. 15RT
D. 4RT
10. With what minimum acceleration can a firemen slide down a rope while breaking strength of the rope is 2/3 his weight
A. g/3
B. 2g/3
C. zero
D. g
11. A stone of mass m is tied to a string of length l and rotated in a circle with a constant speed v. If the string is released, the stone flies
A. Tangential outward
B. Radically outward
C. Radially inward
D. With an acceleration mv2/l
12. A bomb of mass 3.0 kg explodes in air into two pieces of masses 2.0 kg and 1.0 kg. The smaller mass goes at a speed of 80 m/s. The total energy imparted to the two fragments is
A. 1.07 kJ
B. 2.14 kJ
C. 2.4 kJ
D. 4.8 kJ
13. 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
14. Three objects coloured black, gray and can withstand hostile conditions upto 2800°C. These objects are thrown into a furnance where each of them attains a temperature of 2000°C. Which object will glow brightest?
A. l the white onject
B. the black object
C. the gray object
D. all glow with equal brightness
15. The condition that the image is not formed on the screen placed on the other side of lens, when the object is placed before the lens
A. Between 2F and F
B. Between F and optical centre
C. Between 2F and infinity
D. At F
16. A solid cylinder of mass 20 kg is turned by 50 W motor against a friction band. After 4 minutes, the temperature rises from 20°C to 30°C. The specific heat capacity of the material oi the cylinder is
A. 600 J/kg
B. 200 J/kg
C. 150 J/kg
D. 10 J/kg
17. An ideal gas heat engine operates in a Carnot cycle between 227°C and 127°C. It absorbs 6 x 104 cal at the higher temperature. The amount of heat converted into work is
A. 4.8 x 104 cal
B. 1.2 x 104 cal
C. 3.5 x 104 cal
D. 1.6 x 104 cal
18. 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
19. More liquid rises in a thin tube because of
A. Smaller value of radius
B. Smaller value of surface tension
C. Larger value of radius
D. Larger value of surface tension
20. By sucking through a straw. a student can reduce the pressure in his lungs to 750 mm of Hg density 13.6 gm/cc. Using the straw. he can drink water from a glass upto a maximum depth of
A. 10 cm
B. 75 cm
C. 13.6 cm
D. 1.36 cm
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