20001.The absorption of ink by blotting paper involves
viscosity of ink
capillary action phenomenon
diffusion of ink through the blotting
siphon action
20045.Optical fibre works on the
principle of refraction
total internal reflection
scattering
interference
20057.In which of the following industries is mica as a raw material?
Cement
Glass and Pottery
Iron and Steel
Electrical
20016.Of the following properties of a wave, the one that is independent of the other is its
amplitude
velocity
wavelength
frequency
20053.Solar eclipse will take place when
the sun is between the moon and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth
the moon does not lie on the line joining the sun and the earth
20044.Mercury is commonly used as a thermometric fluid rather than water because
specific heat of mercury is less than water
specific heat of mercury is more than water
mercury has greater visibility than water
density of mercury is more than the water
20029.Inside an aeroplane, flying at a high altitude,
the pressure is the same as that outside
normal atmospheric pressure is maintained by the use of air pumps
the pressure inside is less than the pressure outside
normal humidity and partial vacuum are maintained
20046.Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
4.2 seconds
42 seconds
4.2 years
42 years
19999.Radiocarbon is produced in the atmosphere as a result of
collision between fast neutrons and nitrogen nuclei present in the atmosphere
action of ultraviolet light from the sun on atmospheric oxygen
action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
lightning discharge in atmosphere
20017.Lux is the SI unit of
intensity of illumination
luminous efficiency
luminous flux
luminous intensity
20037.On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
metals have higher thermal capacity than plastics
plastics have a lower density than metals
metals are good conductor of heat
plastics have a higher thermal conductivity than metals
20042.Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
X-rays
ultraviolet light
visible light
radio waves
20005.Metals are good conductors of electricity because
they contain free electrons
the atoms are lightly packed
they have high melting point
All of the above
20028.Of the following natural phenomena, tell which one known in Sanskrit as deers thirst?
Rainbow
Earthshine
Halo
Mirage
20040.Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
at sea level
at the top of Mt. Everest
at a place in a valley below sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
20008.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
velocity
momentum
acceleration
kinetic energy