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Mechanics

219 MCQ questions with answers and explanations · page 8 of 9

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Q176. The escape velocity of the Earth is-

  1. A15 km/s
  2. B21.1 km/s
  3. C7.0 km/s
  4. D11.2 km/s
Show answer & explanation

Answer: D) 11.2 km/s

Q177. Pascal is the unit of-

  1. Aof humidity
  2. Bof pressure
  3. Cof rain
  4. Dof temperature
Show answer & explanation

Answer: B) of pressure

Q178. 1 kPa/cm pressure is equivalent to-

  1. A01 time
  2. B1.0 times
  3. C10.0 times
  4. D100.0 times
Show answer & explanation

Answer: A) 01 time

Q179. What is measured by cusec?

  1. Apurity of water
  2. Bdepth of water
  3. Cflow of water
  4. Damount of water
Show answer & explanation

Answer: C) flow of water

Q180. Weight of a body-

  1. AIt is the same everywhere on the Earth's surface
  2. BIt is highest at the poles.
  3. Cis higher at the equator
  4. DIt is more prevalent in the mountains than in the plains
Show answer & explanation

Answer: B) It is highest at the poles.

Q181. When an object is taken from the Earth to the Moon, then-

  1. Ahis weight increases
  2. Bhis weight decreases
  3. Cthere is no change in its weight
  4. DIt becomes completely weightless,
Show answer & explanation

Answer: B) his weight decreases

Q182. Match List-1 and List-II and select the correct answer from the codes given below: List-1 (Quantity) List-II (Unit) A. Electric force 1. Volt B. Electric charge 2. Newton C. Electric potential 3. Coulomb D. Electric capacitance 4. Farad

  1. AABCD 1 2 3 4
  2. BABCD 2 3 1 4
  3. CABCD 4 3 2 1
  4. DABCD 2 3 4 1
Show answer & explanation

Answer: B) ABCD 2 3 1 4

Q183. A geostationary satellite moves continuously in its orbit. This happens due to the effect of centrifugal force, which is produced by:

  1. Arocket engines that propel satellites
  2. Bthe gravity exerted by the Earth on the satellite
  3. Cthe gravitational force exerted by the Sun on the satellite
  4. Dthe gravity exerted by the satellite on the Earth
Show answer & explanation

Answer: B) the gravity exerted by the Earth on the satellite

Q184. Automatic wristwatches are powered by

  1. Afrom cramps
  2. Bfrom the battery
  3. Cfrom liquid crystals
  4. DBy the various movements of our hands
Show answer & explanation

Answer: D) By the various movements of our hands

Q185. When we pull up a bucket of water from a well, we feel that the bucket-

  1. Ahas become heavier above the surface of the water
  2. BIt has become lighter above the water surface.
  3. CLost stability coming out of the water
  4. DComing out of the water, its mass has increased
Show answer & explanation

Answer: A) has become heavier above the surface of the water

Q186. Weightlessness is-

  1. AZero position of gravity
  2. Bwhen gravity decreases
  3. Cin vacuum conditions
  4. Dneither of the above
Show answer & explanation

Answer: A) Zero position of gravity

Q187. Which of the following is most elastic?

  1. Arubber
  2. Bwet soil
  3. CSteel
  4. Dplastic
Show answer & explanation

Answer: C) Steel

Q188. If the linear momentum of a moving body is doubled by the application of a force, then its kinetic energy-

  1. Awill increase eightfold
  2. Bwill increase fourfold
  3. Cwill double
  4. Dwill remain the same
Show answer & explanation

Answer: B) will increase fourfold

Q189. The energy stored in the spring of a watch is-

  1. Akinetic energy
  2. Bpotential energy
  3. Cheat energy
  4. Dchemical energy
Show answer & explanation

Answer: B) potential energy

Q190. The feeling of weightlessness in a spacecraft in orbit is due to-

  1. ALack of external gravity
  2. BThe acceleration in orbit is equal to the acceleration due to external gravity
  3. CExternal gravity, but not inside the spacecraft
  4. DSpacecraft in orbit lose energy
Show answer & explanation

Answer: B) The acceleration in orbit is equal to the acceleration due to external gravity

Q191. A stone tied to a string is rotated rapidly in a circle. If the string suddenly breaks while rotating, then-

  1. AThe stone touches and flies linearly
  2. BThe stone moves inwards radially
  3. CThe stone moves radially outwards
  4. DThe speed of the stone depends on its velocity.
Show answer & explanation

Answer: A) The stone touches and flies linearly

Q192. An egg sinks in soft water but floats in a concentrated salt solution because-

  1. AThe egg absorbs salt from the solution and expands
  2. BThe albumin dissolves in the salt solution and the egg becomes lighter.
  3. CThe density of the salt solution becomes greater than the density of the egg.
  4. DWater has high surface tension.
Show answer & explanation

Answer: C) The density of the salt solution becomes greater than the density of the egg.

Q193. What should a person do to reduce his (angular) speed on a freely rotating platform?

  1. Ajoin your hands together
  2. Braise your hands up
  3. CSpread your hands outwards
  4. DSit down with your hands raised
Show answer & explanation

Answer: C) Spread your hands outwards

Q194. Why does soap help in better cleaning of clothes?

  1. AIt reduces the surface tension of the solution
  2. BIt absorbs dirt
  3. CIt gives strength to the solution
  4. DSoap acts as a catalyst.
Show answer & explanation

Answer: A) It reduces the surface tension of the solution

Q195. Newton meter is the unit of-

  1. Aof acceleration
  2. Bof force
  3. Cof power
  4. Dof energy
Show answer & explanation

Answer: D) of energy

Q196. Dynamo converts it into

  1. Amechanical energy into magnetic energy
  2. Bmechanical energy into electrical energy
  3. Celectrical energy into mechanical energy
  4. Dnone of these
Show answer & explanation

Answer: B) mechanical energy into electrical energy

Q197. On removing cream from milk-

  1. AIncreases the density of milk
  2. BThe density of milk decreases
  3. CThe density of milk remains unchanged.
  4. Dnone of these
Show answer & explanation

Answer: A) Increases the density of milk

Q198. Which one of the following statements is not correct?

  1. AThe weight of any body is different on different planets.
  2. BThe mass of any body is the same on Earth, on the Moon and in the empty sky.
  3. CThe state of weightlessness of any body occurs when it is balanced against the gravitational force acting on it.
  4. DThe weight and mass of any body at sea level on the surface of the Earth are the same.
Show answer & explanation

Answer: D) The weight and mass of any body at sea level on the surface of the Earth are the same.

Q199. What is the amount of matter in a steel sphere?

  1. AWeight
  2. BMass
  3. Cdensity
  4. Dvolume
Show answer & explanation

Answer: B) Mass

Q200. There is no atmosphere on the Moon because-

  1. AIt is near the Earth
  2. Bit revolves around the sun
  3. CIt gets light from the sun.
  4. DHere the escape velocity of atoms is less than their root mean square velocity
Show answer & explanation

Answer: D) Here the escape velocity of atoms is less than their root mean square velocity

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