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PHYSICS MCQs

Total Questions : 3767 | Page 35 of 377 pages
Question 341. Electrical burns occur principally because of
  1.    Radiation pulses of the electricity
  2.    The heat generated by the flow of electrical current through the body
  3.    The high energy of electrons
  4.    All of the above
 Discuss Question
Answer: Option B. -> The heat generated by the flow of electrical current through the body
Question 342. The SI unit of resistance is:
  1.    Newton
  2.    Coulomb
  3.    Ohm
  4.    Joule
 Discuss Question
Answer: Option C. -> Ohm
Question 343. Electrical Energy is the energy of
  1.    Protons
  2.    Neutrons
  3.    Electrons
  4.    All the above
 Discuss Question
Answer: Option C. -> Electrons
Question 344. As water is cooled from 4 deg C to 0 deg C, its density
  1.    Increases
  2.    Decreases
  3.    Remains same
  4.    None of the above
 Discuss Question
Answer: Option B. -> Decreases
Question 345. Fish and other aquatic creatures can live inside a deep frozen pond because
  1.    Fish are cold-blooded animals
  2.    Ice is a bad conductor of heat
  3.    There will always be water just beneath the ice level
  4.    They can adapt themselves to live in ice
 Discuss Question
Answer: Option C. -> There will always be water just beneath the ice level
Question 346. The density of a gas is maximum at
  1.    Low temperature, low pressure
  2.    Low temperature, high pressure
  3.    High temperature, low pressure
  4.    High temperature, high pressure
 Discuss Question
Answer: Option B. -> Low temperature, high pressure
Question 347. Lakes freeze in cold countries in winter, leaving the water underneath at
  1.    0°C
  2.    0°F
  3.    4°C
  4.    4°F
 Discuss Question
Answer: Option C. -> 4°C
Question 348. A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated, it will
  1.    Remain straight
  2.    Bend towards right
  3.    Bend towards left
  4.    None of these
 Discuss Question
Answer: Option C. -> Bend towards left
Question 349. Thermal expansion of materials arises from
  1.    Strong bonds
  2.    Thermal vibrations
  3.    Weak bonds
  4.    Asymmetry of potential energy curve
 Discuss Question
Answer: Option D. -> Asymmetry of potential energy curve
Question 350. A fresh egg when placed in salt water will
  1.    Sink and go to the bottom
  2.    Sink but will not go to the bottom
  3.    Float
  4.    Burst
 Discuss Question
Answer: Option C. -> Float

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