Q.1
A permanent magnet can affect
Q.2
In total internal reflection, the light travel from
Q.3
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly
Q.4
Two stones of different masses are dropped simultaneously from the top of a building
Q.5
A man jumping out of a moving train is thrown
Q.6
A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will
Q.7
The magnitude of buoyant force depends on the ________ of the fluid.
Q.8
A gas thermometer is more sensitive than a liquid thermometer because a gas :
Q.9
What is the SI unit of temperature?
Q.10
What is the principle of a ''Life Jacket"?
Q.11
When a piece of stone is immersed in water, it displaces water of equal
Q.12
When a ship enters the sea from a river
Q.13
The apparent weight of a man in a lift is less the real weight when :
Q.14
A freely suspended magnet remains horizontal at
Q.15
An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's
Q.16
A solid needle placed horizontally on the surface of the water floats due to
Q.17
Purity of a metal can be determined with the help of
Q.18
Earliest thermometer was developed by
Q.19
The absolute zero is a temperature at which ________
Q.20
Absolute Zero is defined as
Q.21
At what temperature (in degree Celsius), the numerical values on Celsius and Fahrenheit scales become equal?
Q.22
The temperature which has the same reading on both Fahrenheit and Celsius scales is
Q.23
Convex mirrors are used as a rear view mirror in motor cycles because
Q.24
It is easier for a man to swim in sea water, than in river water because
Q.25
At what temperature do the Fahrenheit and Celsius scales give the same reading?
Q.26
The temperature of a liquid is 32° F. What is its temperature in Celsius scale?
Q.27
A balloon filled with hydrogen will
Q.28
Buoyancy depends on
Q.29
An optically plane surface reflects a beam of light
Q.30
The focal length of a concave mirror with a radius of curvature of 20.0 cm is :
Q.31
Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be
Q.32
The type of mirror used in automobiles to see the traffic on the rear side is
Q.33
If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of the mirror is:
Q.34
At what temperature (in Fahrenheit) pure water freezes?
Q.35
On the Kelvin scale, the melting point of ice is
Q.36
A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be :
Q.37
To convert temperature from Celcius to Kelvin scale, you must ________ the given temperature.
Q.38
0°K is equivalent to
Q.39
The type of mirrors used in the headlamp of cars is
Q.40
Which one of the following reflects back more sunlight as compared to other three?
Q.41
After reflection from a plane mirror the word will look like.
Q.42
The snow on the mountains does not melt all at once when it is heated by the sun because:
Q.43
Total internal reflection can not take place when light goes from :
Q.44
A rear-view mirror for driving is
Q.45
The phenomenon which causes mirage is
Q.46
Rear view mirror of car is convex or concave?
Q.47
In very cold countries alcohol is used as a thermometric liquid because
Q.48
Shaving mirror is
Q.49
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?
Q.50
A small gap is left at the joints of rails in a railway track to
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