11.
Which one among the following properties of a
proton may change while it moves freely in a magnetic field?
a)
Speed
b)
Charge
c)
Mass
d)
Velocity
12.
A piece of paper and a coin both having the same
mass are dropped from the 10th floor a building. The piece of paper would
tall more time to reach the ground because.
a)
Gravitational pull on the paper is less than the
coin.
b)
Buoyant force on the piece of paper is more than
that on the coin
c)
Buoyant force on the coin is more and acts in
the downward direction the piece of
paper takes a longer path to reach the
ground. D. the piece of paper takes a longer path to reach the ground.
d)
The piece of paper takes a longer path to reach
the ground.
13.
During sunrise and sunset, sun appears reddish –
orange because.
a)
During that time sun emits only reddish – orange
light.
b)
All other colours are absorbed by the atmosphere
c)
Reddish – orange light is least scattered by the
atmosphere
d)
All other colours apart from reddish – orange
are reflected back by the atmosphere.
14.
Ohm’s law can also be taken as a statements for
a)
Conservation of energy
b)
Conservation of electric charge
c)
conservation of angular momentum
d)
Non – conservation of momentum of the flowing
charges.
15.
Suppose we have an iron nail and an iron bal of
same mass. When submerged in water, the iron ball may float, but the nail
always sinks. This is because.
a)
Buoyant force on the ball is larger than that of
the nail due to their shapes
b)
Viscous force on the ball is higher
c)
Viscous force on the nail is higher
d)
Gravitational force affects the ball differently
from the nail.
16.
Bats can know about their prey at a distance
even in the night by emitting
a)
Infra – red lights
b)
Ultraviolet lights
c)
Chemicals from their body
d)
Ultrasonic sounds
17.
Rays of light get refracted while passing from
air to glass because.
a)
Density of glass is higher than that of air
b)
They cannot be reflected from a glass surface
c)
Glass absorbs energy from the light rays
d)
Speed of light in glass is less than the speed
of light in air.
18.
White light while passing through a glass prism
breaks up into light of different colours because.
a)
Refractive index of glass for different colours
of light is different
b)
Glass prism absorbs white light and emits lights
of several colours in different
directions.
c)
Of total internal reflection of white light on
surfaces of the prism.
d)
Of the interference of different colours inside
the prism
19.
Centigrade an Fahrenheit temperatures are the
same at
a)
-273˚
b)
-40˚
c)
32˚
d)
40˚
20.
The dimensional formula for universal
gravitational constant is
a)
M-²
b)
M-¹L³T²
c)
M¹ L³T²
d)
M L²T²
ANSWERS
11.D
12.B
13.C
14.A
15.A
16.D
17.A
18.A
19.B
20.B