Physics Selected Questions and Answers Set 4

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Q.1:- Which of the following is a scalar quantity ?

  1. Electric Current
  2. Electric Field
  3. Acceleration
  4. Linear Momentum

Ans:- (a) Electric Current

Q.2:- The instrument used to measure pressure ?

  1. Aneroid Barometer
  2. Anemometer
  3. Thermometer
  4. Hygrometer

Ans:- (a) Aneroid Barometer

Q.3:- Which of the following works on the basis of conservation of linear momentum ?

  1. Rocket
  2. Helicopter
  3. Jet
  4. Aeroplane

Ans:- (a) Rocket

Q.4:- Definition of force comes from Newton’s ?

  1. First law of motion
  2. Second law of motion
  3. Third law of motion
  4. Law of gravitation

Ans:- (a) First law of motion

Q.5:- A The shape of a rain drop is spherical due to ?

  1. Viscosity
  2. Surface Tension
  3. Elasticity
  4. Gravitation

Ans:- (b) Surface Tension

Q.6:- A floating body always displaces liquid equal to its own ?

  1. Mass
  2. Volume
  3. Weight
  4. None

Ans:- (c) Weight

Q.7:- ‘Dynamic Lift’ is related to ?

  1. Bernouli’s Theorem
  2. Archimedes’ Principle
  3. Equation of continuity
  4. Pascal’s Law

Ans:- (a) Bernouli’s Theorem

Q.8:- SI unit of heat is ?

  1. Calorie
  2. Joule
  3. Kilo Calorie
  4. Kelvin

Ans:- (b) Joule

Q.9:- The gas thermometer is more sensitive than the liquid thermometers because gases ?

  1. Expand more than liquids
  2. Do not change their states easily
  3. Are much lighter
  4. Are easy to obtain
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Ans:- (a) Expand more than liquids

Q.10:- SI unit of temperature is ?

  1. Kelvin
  2. Celsius
  3. Fahrenheit
  4. Joule

Ans:- (a) Kelvin

Q.11:- The temperature of the Sun is measured with ?

  1. Platinum thermometer
  2. Pyrometer
  3. Gas thermometer
  4. Vapour pressure thermometer

Ans:- (b) Pyrometer

Q.12:- A liquid initially contracts when cooled down to 4 degree Celsius but on further cooling down to 0 degree Celsius, it expands. The liquid is ?

  1. Alcohol
  2. Water
  3. Molten Iron
  4. Mercury

Ans:- (b) Water

Q.13:- If an ideal gas is isothermally expanded, its internal energy will ?

  1. Increase
  2. Decrease
  3. Remain the same
  4. None of these

Ans:- (c) Remain the same

Q.14:- Which of the following substances has greatest specific heat ?

  1. Iron
  2. Water
  3. Copper
  4. Mercury

Ans:- (b) Water

Q.15:- The unit of latent heat is ?

  1. Cal-g
  2. Cal/oC
  3. Cal/g
  4. None of these

Ans:- (c) Cal/g

Q.16:- Device used to measure very high temperature is ?

  1. Pyrometer
  2. Thermometer
  3. Bolometer
  4. Calorimeter

Ans:- (a) Pyrometer

Q.17:- Heat given to an ideal gas under isothermal conditions is used ?

  1. Increasing the temp
  2. In doing external work
  3. In increasing the internal energy
  4. None of these
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Ans:- (b) In doing external work

Q.18:- A gas behaves as an ideal gas more closely at ?

  1. Low pressure and high temp
  2. High pressure and low temp
  3. Low pressure and low temp
  4. High pressure land high temp

Ans:- (c) Low pressure and low temp

Q.19:- The absorptive power of a perfectly black body is ?

  1. 1
  2. None

Ans:- (a) 1

Q.20:- The freezer in a refrigerator is located at the top section so that ?

  1. The entire chamber of the refrigerator is cooled quickly due to convection
  2. The motor is not heated
  3. The heat gained from the environment is high
  4. The heat gained from the environment is low

Ans:- (a) The entire chamber of the refrigerator is cooled quickly due to convection

Q.21:- The thermal conductivity of a plate depends on ?

  1. The temperature difference between the two sides
  2. The thickness of the plate
  3. The area of the plate
  4. None of these above

Ans:- (c) The area of the plate

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Q.22:- Which colour of heat radiation represents the highest temperature ?

  1. Blood Red
  2. Dark Cherry
  3. Salmon
  4. White

Ans:- (d) White

Q.23:- If the temperature at which the speed of sound in air becomes double of its value at 27 oC ?

  1. 54 oC
  2. 327 oC
  3. 927 oC
  4. -123 oC

Ans:- (c) 927 oC

Q.24:- The quality of sound produced by an instrument depends on the ?

  1. Frequency
  2. Intensity
  3. Number of overtones
  4. None of these

Ans:- (c) Number of overtones

Q.25:- Pitch of sound depends on ?

  1. Frequency
  2. Wavelength
  3. Amplitude
  4. Speed

Ans:- (a) Frequency