Radiocarbon is produced in the atmosphere as a result of

It is easier to roll a stone up a sloping road than to lift it vertical upwards because

The absorption of ink by blotting paper involves

Siphon will fail to work if

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

Nuclear sizes are expressed in a unit named

Light year is a unit of

Mirage is due to

Light from the Sun reaches us in nearly

Stars appears to move from east to west because

Pa(Pascal) is the unit for

Planets do not twinkle because

Metals are good conductors of electricity because

Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

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

Pick out the scalar quantity

Rectifiers are used to convert

out of the following, which is not emitted by radioactive substance?

Sound waves in air are

Magnetism at the centre of a bar magnet is

It is more difficult to walk on a sandy road than on a concrete road because

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

Of the following properties of a wave, the one that is independent of the other is its

Lux is the SI unit of

On a rainy day, small oil films on water show brilliant colours. This is due to

Point 1 is at a lower electrical potential than point 2. An electron between them on the line joining them will

Materials for rain-proof coats and tents owe their water-proof properties to

RADAR is used for

Sound of frequency below 20 Hz is called

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

Suitable impurities are added to a semiconductor depending on its use. This is done in order to

Stars twinkle because

It takes much longer to cook food in the hills than in the plains, because

Moment of inertia is

Of the following natural phenomena, tell which one known in Sanskrit as ‘deer’s thirst’?

Inside an aeroplane, flying at a high altitude,

Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

One thousand microns is equal to

Sound travels at the fastest speed in

oil raise up the wick in a lamp. The principle involves

Superconductors are substances which

Light travels at the fastest speed in

Railway tracks are banked on curves

On a cold day when a room temperature is 15^oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15^oC, because

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?

Intensity of sound at a point is ____ its distance from the source.

Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

Radio telescopes are better than optical telescopes because

Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

Out of the following pairs, which one does not have identical dimension?

Mercury is commonly used as a thermometric fluid rather than water because

Optical fibre works on the

Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

Supersonic plane fly with the speed

Mach number is used in connection with the speed of

On a stationary sail boat, air is blown from a fan attached to the boat. The boat

Rainbow is due to

Stars which appear single to the naked eye but are double when seen through a telescope are

ML²T^-2 is the dimensional formula for

Solar eclipse will take place when

Isotopes of an element contain

One watt-hour is equivalent to

Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?

In which of the following industries is mica as a raw material?

Radiocarbon dating technique is used to estimate the age of

Identify the vector quantity from the following

Large astronomical telescopes always use as objective

One should not connect a number of electrical appliances to the same power socket because

Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?

1.Diffusion

2.Refraction

3.Internal reflection

Natural radioactivity was discovered by

Planets are

One nanometer is equal to

Mica is used in electrical appliances such as electric iron because mica is

It is easier to roll a barrel full of coal tar than to pull it because

Minimum number of unequal vectors which can give zero resultant are

Intensity of sound has

Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from

An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point 1 on the ground a bomb is released from it. The bomb strikes the ground at point 2. The distance 12 is