1.
Fuel for nuclear reactors is - Plutonium
2.
The man talking on the surface of the moon - Can not hear the sound of each other
3.
X-rays were discovered by - Rontgen
4.
The theory of electrolysis was
propounded by - Faraday
5.
Primary colours are – Red, blue and green
6.
The earth moves round the sun in an elliptical path and not in circular one, so
the distance between the two is not fixed but keeps on varying as the earth
goes around the sun. The speed of the earth in its orbital path around the
sun - Decreases when the distance between the sun
and the earth increases and vice versa
7.
Kinetic energy is the energy
possessed by the body by virtue of its motion,
potential energy is possessed by the
body by virtue of its - Position or shape
8.
A ray of light from air enters water, then through a thick layer of glass placed
below water. After passing through glass, it again comes out in air medium. Then
the final emergent ray will - Suffer lateral displacement
9.
Water in a reservoir exerts pressure - In all directions
10.
Welding is to joint two pieces of
metals by raising the temperature at
the joint by means of the external heat of heavy electric current, soldering is - To
use an alloy for joining metal
11.
Two objects losing the same weight when immersed in water must have the
same - Volume
12.
Mention the ray which appears to originate out side of the earth - Cosmic
ray
13.
What is always contained in amalgams
- Mercury
14.
Sound travels fastest in - Steel
15.Short radio waves are not dangerous, while cosmic rays, Ultra-violet rays, X-rays and
gamma rays are dangerous.
16.
Jet engines are -
Reaction engine
17.
Water is used in hot water bottles because - It has high specific heat
18.
Hydrogen bomb is based on the
phenomenon of - Nuclear
fusion
19.
The rate of loss of heat by a hot body depends upon - its radiating area, its temperature, its
nature of radiating surface -all of the above factors
20.
Comets are luminous celestial bodies
moving around the - Sun
21.
It takes less time for food to be cooked in a pressure cooker. It is because -
Boiling point of water increases
22.
The process in which no heat changes takes place is -
An adiabatic process
23.
The name of the Galaxy in which the
earth is a planet is - The
Milky Way
24.
Two pieces of gold and silver weighing 100 gm. Each are immersed in a liquid.
Then what will happen - Gold piece will weigh more
25.
An athlete claimed that his timing for a 100 meter dash should be corrected
because the starting signal was given by a gun fired from a point 10 m away
from him and the time keeper was standing close to the gun. The error due to
this could be - 0.03
sec.
26.
The material used in the manufacture of lead pencil is - Graphite
27.
Woolen clothes keep us warm in
winter because they - Prevent the heat of the body from escaping
28.
Water pipes are apt to burst in cold weather because - The water in the pipe freezes into ice and expands
29.
Metal tea pots have wooden handles because - Wood
is bad conductor of heat
30.
A sextant is used to measure - Height
of an object
31.
The image of anything seen through an ordinary looking glass is - laterally
inverted
32.
The principle involved in the absorption of ink or water by a piece of blotting
papers is - Capillary action
33.
When a man circles round the earth in a satellite then his - Mass remains constant but weight becomes zero
34.
The colour of a star is an indication of its - Temperature
35.
The tides in the ocean are due to - Gravitational pull of the moon
36.
For stable equilibrium of a floating body it is necessary that its metacentric
should be - above of its centre of gravity
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