General physics

General physics- Knowledge test

Question 1 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Siphon will fail to work if
A
the densities of the liquid in the two vessels are equal
B
the level of the liquid in the two vessels are at the same height
C
both its limbs are of unequal length
D
the temperature of the liquids in the two vessels are the same






Question 2 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Supersonic plane fly with the speed
A
less than the speed of sound
B
of sound
C
greater than the speed of sound
D
of light
Question 3 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Suitable impurities are added to a semiconductor depending on its use. This is done in order to
A
increase its life
B
enable it to withstand higher voltages
C
increase its electrical conductivity
D
increase its electrical resistivity






Question 4 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
A
Pressure and Young's modules
B
Planck's constant and Angular momentum
C
Impulse and moment of force
D
Force and rate of change of linear momentum
Question 5 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Out of the following pairs, which one does not have identical dimension?
A
Moment of inertia and moment of a force
B
Work and Torque
C
Angular momentum and Planck's constant
D
Impulse and Momentum






Question 6 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Optical fibre works on the
A
principle of refraction
B
total internal reflection
C
scattering
D
interference
Question 7 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Mirage is due to
A
unequal heating of different parts of the atmosphere
B
magnetic disturbances in the atmosphere
C
depletion of ozone layer in the atmosphere
D
equal heating of different parts of the atmosphere






Question 8 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Pa(Pascal) is the unit for
A
thrust
B
pressure
C
frequency
D
conductivity
Question 9 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
oil raise up the wick in a lamp. The principle involves
A
the diffusion of oil through the wick
B
the liquid state of oil
C
capillary action phenomenon
D
volatility of oil






Question 10 ->Click on any option to know the correct answers (सही उत्तर जानने के लिए किसी भी Choice पर क्लिक करें)
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
A
the heating effect of current alone
B
hysteresis loss alone
C
both the heating effect of current and hysteresis loss
D
intense sunlight at noon
There are 10 questions to complete.

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