Q.1

Moment of inertia is

  • vector
  • scalar
  • phasor
  • tensor
Q.2

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

  • amplitude
  • velocity
  • wavelength
  • frequency
Q.3

Planets do not twinkle because

  • they emit light of a constant intensity
  • their distance from the earth does not change with time
  • they are very far away from the earth resulting in decrease in intensity of light
  • they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
Q.4

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

  • east
  • west
  • northeast
  • southeast
Q.5

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
Q.6

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

  • Rainbow
  • Earthshine
  • Halo
  • Mirage
Q.7

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
Q.8

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

  • work done in rolling is more than in lifting
  • work done in lifting the stone is equal to rolling it
  • work done in both is same but the rate of doing work is less in rolling
  • work done in rolling a stone is less than in lifting it
Q.9

The absorption of ink by blotting paper involves

  • viscosity of ink
  • capillary action phenomenon
  • diffusion of ink through the blotting
  • siphon action
Q.10

Siphon will fail to work if

  • the densities of the liquid in the two vessels are equal
  • the level of the liquid in the two vessels are at the same height
  • both its limbs are of unequal length
  • the temperature of the liquids in the two vessels are the same
Q.11

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

  • the heating effect of current alone
  • hysteresis loss alone
  • both the heating effect of current and hysteresis loss
  • intense sunlight at noon
Q.12

Nuclear sizes are expressed in a unit named

  • Fermi
  • angstrom
  • newton
  • tesla
Q.13
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be
Q.14

An aeroplane is flying horizontally with a velocity ofkm/h and at a height ofm. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

  • 1200 m
  • 0.33 km
  • 3.33 km
  • 33 km
Q.15

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 ism/s, what could be the maximum and minimum distances between the two persons?

  • 1.8 km, 0.15 km
  • 2.2 km, 0.20 km
  • 2.8 km, 0.25 km
  • 3.3 km, 0.30 km
0 h : 0 m : 1 s