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We have listed important basic Physics questions and answers. These physics gk questions are frequently asked in many competative exams, you should go through it.
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Q 61.
By what process is heat transmitted from the filament of an evacuated electric bulb to the glass ?
Ans.
Radiation
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Q 62.
If the K.E of a body is increased by 300%, its momentum will increase by ?
Ans.
100%
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Q 63.
Magnetic, electrostatic and gravitational forces come under which category ?
Ans.
Non contact forces
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Q 64.
The freezer in a refrigerator is fitted near the top ?
Ans.
So that it can cool the whole interior by setting up convection currents
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Q 65.
Woollens keep us warm in winter because ?
Ans.
They do not allow our body heat to escape
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Q 66.
If a bomb dropped from an airplane explodes in mid-air ?
Ans.
Its KE increases
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Q 67.
The distance between two crests in a wave is given by ?
Ans.
Wavelength
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Q 68.
A thermostat is a device for ?
Ans.
Regulating temperature
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Q 69.
An iron hammer, lying in the sun, appears much hotter than its wooden handle because ?
Ans.
Iron is a good conductor of heat
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Q 70.
A body moves with a constant speed along a curved path its acceleration ?
Ans.
Is perpendicular to its velocity
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Q 71.
Fish can survive inside a frozen lake because ?
Ans.
Water near the bottom does not freeze
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Q 72.
The value of one quantity remains same in all system of units ?
Ans.
Specific energy
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Q 73.
If water in a lake were to behave like other liquids, then in extremely cold weather it would freeze ?
Ans.
From bottom to top
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Q 74.
When a cube of ice floating on water in s beaker melts, the level of water in the beaker ?
Ans.
Remains the same
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Q 75.
This statement is correct about Energy ?
Ans.
Energy can neither be created nor destroyed.
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Q 76.
What will be the impact on the duration of swinging of a pendulum if it is carried on moon ?
Ans.
It will increase
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Q 77.
In cold countries alcohol is preferred to mercury as a thermometric liquid because ?
Ans.
Alcohol has a very low freezing point
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Q 78.
The science dealing with the study of phenomena at very low temperature is known as ?
Ans.
cryogenics
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Q 79.
A person stands at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of the room, while continuing to remain in a vertical plane. The path traced by a person standing at the middle point of the slipping ladder is ?
Ans.
A circular path
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Q 80.
A football bounces when it falls on the ground because ?
Ans.
Of its property of elasticity
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Q 81.
The swing of a spinning cricket ball in the air can be explained on the basis of ?
Ans.
Bernoulli's theorem
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Q 82.
An object moves in a circular path with a constant speed is TRUE when ?
Ans.
The centripetal acceleration of the object is smaller for a gentle curve (i.e, curve of larger radius) then that for sharp curve (i.e, curve of smaller radius)
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Q 83.
A body has a free fall from a height of 20 m. After falling through a distance of 5 m, the body would ?
Ans.
Lose one-fourth of its potential energy
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Q 84.
Motion of an oscillating liquid column in a U-tube is ?
Ans.
Periodic but not simple harmonic
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Q 85.
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because ?
Ans.
Cohesion of mercury is greater than its adhesion with glass
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Q 86.
Acting on a non-rigid body, a force can ?
Ans.
Produce dimensional change
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Q 87.
When two mercury drops are brought into contact, they merge to form a bigger drop because liquids have a tendency to possess ?
Ans.
Minimum surface area
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Q 88.
Raindrops are spherical due to ?
Ans.
Surface tension
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Q 89.
Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent ?
Ans.
Reduces drastically the surface tension between water and oil
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Q 90.
If the distance S covered by a moving car in rectilinear motion with a speed V in time T is given by S=VT, then the car undergoes ?
Ans.
A uniform velocity
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