Which one of the followings is referred to as “volatile memory”?

1. 1. Read Only Memory
   2. Random Access Memory
   3. Cache Memory
   4. Flash memory

Which one of the following can be used to focus sunlight?

1. 1. Plane mirror
   2. Concave lens
   3. Concave mirror
   4. Convex mirror

Which one of the following colors has the longest wavelength?

1. 1. Green
   2. Yellow
   3. Blue
   4. Red

Ice floats on water because the density of ice is less than that of water. Out of the following what part of giant icebergs remains above water?

1. 1. 1/10
   2. 1/4
   3. 1/2
   4. 3/4

Which one of the following sets of properties are relevant for an electrical fuse wire needed for normal application?

1. 1. Thick wire, high melting point alloy, short length
   2. Thick wire, low melting point alloy, large length
   3. Short length, low melting point alloy, thin wire
   4. Large length, low melting point alloy, thin wire

The blue color of the sky can be attributed to _____.

1. 1. Differential scattering of sunlight by the atmosphere
   2. Total internal reflection of the sunlight by the atmosphere
   3. Absorption of sunlight
   4. Refraction of sunlight by the atmosphere

The spherical shape of a small drop of rain is due to _____.

1. 1. Viscosity
   2. Surface tension
   3. Atmospheric pressure
   4. Gravity

Which of the following devices is used to step up or step down the voltage of alternating current?

1. 1. Induction coil
   2. Transformer
   3. Transistor
   4. Rectifier

The advantage of AC over DC is that _____.

1. 1. it contains more electrically energy
   2. it is free from voltage fluctuations
   3. its generation costs much less
   4. it can be transmitted over long distances with minimum power loss

Sun and the othe rstars are virtually huge nuclear explosion chambers producing a large amount of heat and light. Yet, we do not hear any of the explosions because _____.

1. 1. beat and light are electromagnetic radiations and travel much faster than sound.
   2. sound waves get attenuated completely before they reach the earth.
   3. the process involved in the interior of the sun and the stars relate to atomic and subatomic particles and not molecules an their vibrations.
   4. the outer space is an absolute vacuum.