Q. On a stationary sail boat, air is blown from a fan attached to the boat. The boat
(A)
moves in opposite direction in which the air is blown
(B)
does not move
(C)
moves in the same direction in which air blows
(D)
spins around
✅ Correct Answer: (B)
does not move
Explanation: In this case air blown by the fan will try to push the sail boat in a certain direction. But at the same time due to Newton's third law of motion the fan will experience a force due to the air blown in a direction opposite to the direction in which the sail boat will experience the force due to the blown air. So, as a whole the system will be at rest and it will not move.
Q. Rainbow is due to
(A)
absorption of sunlight in minute water droplets
(B)
diffusion of sunlight through water droplets
(C)
ionisation of water deposits
(D)
refraction and reflection of sunlight by water droplets
✅ Correct Answer: (D)
refraction and reflection of sunlight by water droplets
Q. Stars which appear single to the naked eye but are double when seen through a telescope are
(A)
novas and supernovas
(B)
binaries
(C)
asteroids
(D)
quasars
✅ Correct Answer: (B)
binaries
Q. Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in
(A)
Conduction
(B)
Radiation
(C)
Both conduction & convection
(D)
Convection
✅ Correct Answer: (D)
Convection
Q. ML2T-2 is the dimensional formula for
(A)
moment of inertia
(B)
pressure
(C)
elasticity
(D)
couple acting on a body
✅ Correct Answer: (D)
couple acting on a body
Q. Solar eclipse will take place when
(A)
the sun is between the moon and the earth
(B)
the earth is between the moon and the sun
(C)
the moon is between the sun and the earth
(D)
the moon does not lie on the line joining the sun and the earth
✅ Correct Answer: (C)
the moon is between the sun and the earth
Q. Isotopes of an element contain
(A)
the same number of protons but different number of neutrons
(B)
the same number of neutrons but different number of protons
(C)
equal number of protons and electrons
(D)
equal number of nucleons
✅ Correct Answer: (A)
the same number of protons but different number of neutrons
Q. One watt-hour is equivalent to
(A)
6.3 x 10^3 J
(B)
6.3 x 10^-7 J
(C)
3.6 x 10^3 J
(D)
3.6 x 10^-3 J
✅ Correct Answer: (C)
3.6 x 10^3 J
Q. Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
(A)
Scattering
(B)
Diffraction
(C)
Interference
(D)
Polarization
✅ Correct Answer: (A)
Scattering
Q. In which of the following industries is mica as a raw material?
(A)
Cement
(B)
Glass and Pottery
(C)
Iron and Steel
(D)
Electrical
✅ Correct Answer: (D)
Electrical
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