Physics Questions and Answers

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Q11
Pa(Pascal) is the unit for
  • A thrust
  • B pressure
  • C frequency
  • D conductivity
Answer: Option B
Q12
Planets do not twinkle because
  • A they emit light of a constant intensity
  • B their distance from the earth does not change with time
  • C they are very far away from the earth resulting in decrease in intensity of light
  • D they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
Answer: Option D
Q13
Metals are good conductors of electricity because
  • A they contain free electrons
  • B the atoms are lightly packed
  • C they have high melting point
  • D All of the above
Answer: Option A
Q14
Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
  • A will overflow
  • B will not rise
  • C depressed
  • D change its meniscus
Answer: Option B
Q15
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
  • A Pressure and Young's modules
  • B Planck's constant and Angular momentum
  • C Impulse and moment of force
  • D Force and rate of change of linear momentum
Answer: Option C
Q16
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
  • A velocity
  • B momentum
  • C acceleration
  • D kinetic energy
Answer: Option B
Q17
Pick out the scalar quantity
  • A force
  • B pressure
  • C velocity
  • D acceleration
Answer: Option B
Q18
Rectifiers are used to convert
  • A Direct current to Alternating current
  • B Alternating current to Direct current
  • C high voltage to low voltage
  • D low voltage to high voltage
Answer: Option B
Q19
out of the following, which is not emitted by radioactive substance?
  • A Electrons
  • B Electromagnetic radiations
  • C Alpha particles
  • D Neutrons
Answer: Option D
Q20
Sound waves in air are
  • A transverse
  • B longitudinal
  • C electromagnetic
  • D polarised
Answer: Option B

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