Q.1
The amount of matter in a ball of steel is its :
Q.2
Which of the following laws validates the statement that matter can neither be created nor destroyed ?
Q.3
The boiling point of liquids vary as
Q.4
Light from Sun reaches Earth in approximately
Q.5
It is dangerous to observe Solar eclipse with naked eyes because
Q.6
Formation of shadows can be explained by
Q.7
Which of the following is arranged in order of decreasing conductivity?
Q.8
Every hot object emits ________
Q.9
The freezing point of fresh water is ________ .
Q.10
Through which light cannot pass?
Q.11
The speed of light in air is
Q.12
Eclipses occur due to which optical phenomena?
Q.13
During hot weather, the fan produces a feeling of comfort. This is because
Q.14
The flow of thermal energy is called
Q.15
Which is an example of Phototropism?
Q.16
Light travels fastest in
Q.17
The locomotion of insects to the source of light is called :
Q.18
Which metal is the best conductor of heat?
Q.19
When hot liquid is poured into a thick glass tumbler, it cracks because glass :
Q.20
Vehicle tyres are inflated properly
Q.21
Friction is caused by the ________ on the two surfaces in contact.
Q.22
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of :
Q.23
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :
Q.24
Which of the following is an insulator?
Q.25
In a railway track, two rails are joined end to end with a gap in between them because
Q.26
Air coolers are more suitable for
Q.27
Light travels slowest in
Q.28
Light from the sun reaches us in nearly
Q.29
Mud houses are cooler in summers and warmer in winters as compared to brick houses because
Q.30
Ball bearings are used in cycles, scooters etc to
Q.31
The force of friction between two surfaces will increase if:
Q.32
'Therm' is the unit of
Q.33
We feel cool when we sit near the fan, this is because
Q.34
When hot-water is sprinkled on a hotter glass tumbler, it breaks because
Q.35
An image formed by a plane mirror, that cannot be obtained on a screen is called ________
Q.36
Heat flows as a result of difference of ________
Q.37
Friction can be reduced by changing from
Q.38
Rolling friction is caused by ________
Q.39
The boiling point of water depends upon the
Q.40
One bar is equal to
Q.41
A gap is left between two rails of a railway track to accommodate...... of the metal.
Q.42
Light beam which is highly directional is called:
Q.43
Speed of light is maximum in ________
Q.44
Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is
Q.45
It is more difficult to walk on ice than on a concrete road because
Q.46
A ball rolling along the ground gradually slows down and finally comes to rest is due to ________
Q.47
Frictional force acts in
Q.48
Pressure Cooker cooks faster because
Q.49
Sound waves cannot travel in
Q.50
In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to
0 h : 0 m : 1 s