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Mechanics

219 MCQ questions with answers and explanations · page 7 of 9

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Q151. If the diameter of the capillary tube is doubled, the height of the water rising in it will increase.

  1. AIt doubles.
  2. Bhalf remains
  3. Cremains the same
  4. Dbecomes zero
Show answer & explanation

Answer: B) half remains

Q152. The unit of viscosity is-

  1. APoise
  2. BPascal
  3. CPowijuli
  4. DNone of these
Show answer & explanation

Answer: A) Poise

Q153. When two vessels of different diameters are immersed vertically in a liquid, the height of the liquid rises-

  1. Awill be equal in both capillaries
  2. BThe capillary tube with larger diameter will have more
  3. CThe smaller diameter capillary tube will have more
  4. Ddepends on the mass of water
Show answer & explanation

Answer: C) The smaller diameter capillary tube will have more

Q154. What causes the oil in the wick of a lamp to rise?

  1. ACarboxylic groups in oil
  2. Bcapillary phenomenon
  3. Clow viscosity of oil
  4. Dpressure difference
Show answer & explanation

Answer: B) capillary phenomenon

Q155. An iron needle sinks in water, but a ship remains afloat. What principle is this based on?

  1. APascal's principle
  2. BArchimedes' principle
  3. CKepler's theory
  4. Dlaw of gravity
Show answer & explanation

Answer: B) Archimedes' principle

Q156. Archimedes' law is related to which of the following?

  1. Alaw of flotation
  2. BRight-angled triangle rule
  3. Claw of gravity
  4. Drelation between current and voltage
Show answer & explanation

Answer: A) law of flotation

Q157. When an object is immersed, either fully or partially, in a liquid, its weight appears to decrease, and this apparent decrease in weight is equal to the weight of the liquid displaced by the object. This principle is:

  1. ABernoulli's principle
  2. BArchimedes' principle
  3. CPascal's principle
  4. DHooke's law
Show answer & explanation

Answer: B) Archimedes' principle

Q158. The scientist associated with buoyancy is-

  1. AArchimedes
  2. BNewton
  3. CLouis Pasteur
  4. Dall of which
Show answer & explanation

Answer: A) Archimedes

Q159. The amount of buoyancy obtained by a solid partially or completely immersed in a liquid depends on—

  1. Athe amount of liquid displaced by the solid
  2. Bon the mass of the solid
  3. Con the weight of the solid
  4. Dnone of these
Show answer & explanation

Answer: A) the amount of liquid displaced by the solid

Q160. The reason why a piece of iron does not float on the water surface is-

  1. AThe weight of water displaced by iron is less than the weight of iron
  2. BThe weight of water displaced by iron is greater than the weight of iron
  3. CThe weight of water displaced by iron is equal to the weight of iron.
  4. DIt does not displace water.
Show answer & explanation

Answer: A) The weight of water displaced by iron is less than the weight of iron

Q161. Any boat will sink if it removes water from its-

  1. Aequal in volume
  2. Bequal to the weight
  3. Cequal to the back
  4. Dequal to the density
Show answer & explanation

Answer: A) equal in volume

Q162. To which country did the great scientist Archimedes belong?

  1. ABritain
  2. BGermany
  3. CU.N.A.
  4. DGreece
Show answer & explanation

Answer: D) Greece

Q163. The reason why water droplets do not stick to oily surfaces is-

  1. Alack of adhesive force
  2. BWater is lighter than oil.
  3. CCan't get along with each other
  4. DSurface tension
Show answer & explanation

Answer: A) lack of adhesive force

Q164. The synchronizing satellite revolves around the Earth in-

  1. AEast to west
  2. BWest to East
  3. CNorth South
  4. DSouth to North
Show answer & explanation

Answer: B) West to East

Q165. The function of ball bearing in a wheel is-

  1. Aincrease friction
  2. BConverting kinetic friction into rolling friction
  3. Cconverting static friction into kinetic friction
  4. Djust for convenience
Show answer & explanation

Answer: C) converting static friction into kinetic friction

Q166. Consider the following statements about jet engines and rockets. 1. A jet engine uses ambient air for its oxygen supply. Therefore, it is unsuitable for space travel. 2. A rocket carries its oxygen supply in the form of gas and fuel. Which of the above statements is/are correct?

  1. Aonly 1
  2. Bonly 2
  3. CBoth 1 and 2
  4. DNeither 1 nor 2
Show answer & explanation

Answer: C) Both 1 and 2

Q167. A piece of ice is floating in a glass of water. What will happen to the level of the water when the ice melts?

  1. Awill increase
  2. BWill be less
  3. Cwill remain the same
  4. DIt will first increase and then decrease
Show answer & explanation

Answer: C) will remain the same

Q168. A ball is dropped from a tall building with a uniform acceleration of 9.8 m/s2. What will its velocity be after 3 seconds?

  1. A9.8m/s.
  2. B9.6m/s
  3. C294m/s
  4. D39.3m/s
Show answer & explanation

Answer: C) 294m/s

Q169. The mass of an object is 100 kg (gravitational force g = 10 ms). If the gravitational acceleration on the moon is , then the mass of the object on the moon will be-

  1. A100 /6 kg
  2. B60 kg
  3. C100 kg
  4. D600 kg
Show answer & explanation

Answer: C) 100 kg

Q170. The SI unit of power 'Watt' is equivalent to what?

  1. Akg m s 2
  2. Bkg m 2 to 2
  3. Ckg m2 to 3
  4. Dnone of these
Show answer & explanation

Answer: C) kg m2 to 3

Q171. In the state of weightlessness, the shape of a candle flame will be-

  1. Alonger
  2. Bmore little
  3. Cspherical
  4. Dwill remain the same
Show answer & explanation

Answer: D) will remain the same

Q172. liquid rises to a greater height in a capillary tube than water, because

  1. AThe liquid is more viscous than water
  2. BThe temperature of the liquid is higher than that of water
  3. CThe surface tension of the liquid is less than that of water
  4. DThe surface tension of the liquid is greater than that of water.
Show answer & explanation

Answer: D) The surface tension of the liquid is greater than that of water.

Q173. Capillarity is not the sole reason for which one of the following?

  1. Aink adsorption
  2. Bgroundwater upwelling
  3. CSpreading of a water drop on a cotton cloth
  4. Dthe movement of water from a plant's roots to its foliage
Show answer & explanation

Answer: D) the movement of water from a plant's roots to its foliage

Q174. Who has formulated the universal law of gravitation?

  1. ANewton
  2. BGalileo
  3. CCopernicus
  4. DEinstein
Show answer & explanation

Answer: A) Newton

Q175. Conservation of energy means that-

  1. AEnergy is created and destroyed
  2. BEnergy can be created, not destroyed.
  3. CEnergy cannot be created, but it can be destroyed.
  4. DEnergy can neither be created nor destroyed.
Show answer & explanation

Answer: D) Energy can neither be created nor destroyed.

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