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PHYSICS MCQs

Total Questions : 3767 | Page 50 of 377 pages
Question 491. Natural radioactivity was discovered by
  1.    Marie Curie
  2.    Ernest Rutherfor
  3.    Henri Becquerel
  4.    Enrico Fermi
 Discuss Question
Answer: Option C. -> Henri Becquerel
Question 492. One nanometer is equal to
  1.    10-6m
  2.    10-8m
  3.    10-9m
  4.    10-5m
 Discuss Question
Answer: Option C. -> 10-9m
Question 493. Planets are
  1.    luminous heavenly bodies revolving around a star
  2.    non-luminous heavenly bodies
  3.    luminous heavenly bodies that twinkle
  4.    luminous heavenly bodies that do not twinkle
 Discuss Question
Answer: Option B. -> non-luminous heavenly bodies
Question 494. Mica is used in electrical appliances such as electric iron because mica is
  1.    a good conductor of heat but a bad conductor of electricity
  2.    a bad conductor of heat but a good conductor of electricity
  3.    a good conductor of heat as well as electricity
  4.    a bad conductor of heat as well as electricity
 Discuss Question
Answer: Option A. -> a good conductor of heat but a bad conductor of electricity
Question 495. It is easier to roll a barrel full of coal tar than to pull it because
  1.    the full weight of the barrel comes into play when it is pulled
  2.    the rolling friction is much less than the sliding friction
  3.    more surface area of the barrel is in contact with the road when it is pulled
  4.    coal tar is a liquid and it flows in the barrel when it is rolled
 Discuss Question
Answer: Option B. -> the rolling friction is much less than the sliding friction
Question 496. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
  1.    east
  2.    west
  3.    northeast
  4.    southeast
 Discuss Question
Answer: Option A. -> east
Question 497. Minimum number of unequal vectors which can give zero resultant are
  1.    two
  2.    three
  3.    four
  4.    more than four
 Discuss Question
Answer: Option B. -> three
Question 498. Intensity of sound has
  1.    an object existence
  2.    a subject existence
  3.    no existence
  4.    both subjective and objective existence
 Discuss Question
Answer: Option A. -> an object existence
Question 499. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
  1.    1200 m
  2.    0.33 km
  3.    3.33 km
  4.    33 km
 Discuss Question
Answer: Option C. -> 3.33 km
Question 500. Which tube used to produce X-ray?
  1.    Coolidge tube
  2.    X-ray tube
  3.    Roentgen
  4.    None of these
 Discuss Question
Answer: Option A. -> Coolidge tube

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