Q.1
Mach number is used in connection with the speed of
Q.2
Identify the vector quantity from the following
Q.3
Isotopes of an element contain
Q.4
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
Q.5
Intensity of sound at a point is ____ its distance from the source.
Q.6
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
Q.7
Out of the following pairs, which one does not have identical dimension?
Q.8
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
Q.9
Rainbow is due to
Q.10
Large astronomical telescopes always use as objective
Q.11
One should not connect a number of electrical appliances to the same power socket because
Q.12
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
Q.13
Sound travels at the fastest speed in
Q.14
Oil raise up the wick in a lamp. The principle involves
Q.15
Sound of frequency below 20 Hz is called
Q.16
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:
Q.17
Inside an aeroplane, flying at a high altitude,
Q.18
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
Q.19
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
Q.20
Radio telescopes are better than optical telescopes because
Q.21
Mercury is commonly used as a thermometric fluid rather than water because
Q.22
Optical fibre works on the
Q.23
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
Q.24
The fuse in our domestic electric circuit melts when there is a high rise in
Q.25
Stars which appear single to the naked eye but are double when seen through a telescope are
Q.26
Lux is the SI unit of
Q.27
On a rainy day, small oil films on water show brilliant colours. This is due to
Q.28
Sound waves in air are
Q.29
Magnetism at the centre of a bar magnet is
Q.30
Superconductors are substances which
Q.31
Light travels at the fastest speed in:
Q.32
Railway tracks are banked on curves
Q.33
Suitable impurities are added to a semiconductor depending on its use. This is done in order to
Q.34
Stars twinkle because
Q.35
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
Q.36
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same:
Q.37
One thousand microns is equal to
Q.38
Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
Q.39
Materials for rain-proof coats and tents owe their water-proof properties to
Q.40
It is more difficult to walk on a sandy road than on a concrete road because
Q.41
Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
Q.42
It takes much longer to cook food in the hills than in the plains, because
Q.43
Pick out the scalar quantity
Q.44
An object having the capability to do work is said to possess
Q.45
Rectifiers are used to convert:
Q.46
Energy per unit volume is dimensionally equal to
Q.47
To open a door easily, the handle should be fixed
Q.48
The wall of a dam is broader at the base
Q.49
It is easy to burst a gas-filled balloon with a needle than with a nail. It is because
Q.50
The rotational effect of a force on a body about an axis of rotation is described in terms of
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