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Physics Practice Questions Set 9
For India's Top Government Exams
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A mobile phone charger is
*
1 point
an inverter
a UPS
a step-down transformer
a step-up transformer
Two layers of cloth of equal thickness provide a warmer covering than a single layer of cloth with double the thickness. Why?
*
1 point
Because of the air encapsulated between two layers
Since the effective thickness of two layers is more
The fabric of the cloth plays the role
The weaving of the cloth plays the role
A ray of white light strikes the surface of an object
.
If all the colours are reflected the surface would appear
*
1 point
black
white
grey
opaque
The motion of an oscillating liquid column in a U
–
tube is
*
1 point
periodic but not simple harmonic
non-periodic
simple harmonic and time period is independent of the density of the liquid
simple harmonic and time period depends on the density of the liquid
In a cricket match, while catching a fast-moving ball, a fielder on the ground gradually pulls his hands backward with the moving ball to reduce the velocity to zero. The act represents ___
*
1 point
Newton’s first law of motion
Newton’s second law of motion
Newton’s third law of motion
Law of conservation of energy
You are asked to jog on a circular track of a radius of 35 m. Right one complete round on the circular track, your displacement and distance covered by you respectively
*
1 point
zero and 220 m
220 m and zero
zero and 110 m
110 m and 220 m
When an incandescent electric bulb glows
*
1 point
the electric energy is completely converted into light
the electric energy is partly converted into light energy and partly into heat energy
the light energy is converted into electric energy
the electric energy is converted into magnetic energy
Dirty clothes containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent ___
*
1 point
reduces drastically the surface tension between water and oil
increases the surface tension between water and oil
increases the viscosity of water and oil
decreases the viscosity in detergent mixed water
The position, relative size
,
and nature of the image formed by a concave lens for an object placed at infinity are respectively
*
1 point
at focus, diminished, and virtual
at focus, diminished and real
between focus and optical center, diminished and virtual
between focus and optical center, magnified and real
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be ___
*
1 point
either plane or convex
plane only
concave
convex only
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