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PHYSICS MCQs

Total Questions : 3767 | Page 37 of 377 pages
Question 361. Q = mcdT refers to
  1.    Enthalpy formula
  2.    Heat Transfer formula
  3.    Specific Heat formula
  4.    Heat of Vaporization
 Discuss Question
Answer: Option C. -> Specific Heat formula
Question 362. Steam at 100°C causes more severe burns than water at 100°C because
  1.    Steam has no specific heat capacity
  2.    Steam has latent heat of vaporisation
  3.    Water has no specific heat capacity
  4.    Water has latent heat of fusion
 Discuss Question
Answer: Option B. -> Steam has latent heat of vaporisation
Question 363. No current will flow between two charged bodies if they have the same
  1.    Resistance
  2.    Charge
  3.    Potential
  4.    Charge/ potential ratio
 Discuss Question
Answer: Option C. -> Potential
Question 364. Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes
  1.    2R
  2.    R/2
  3.    5R/4
  4.    3R/4
 Discuss Question
Answer: Option C. -> 5R/4
Question 365. Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.
  1.    40
  2.    4000
  3.    80
  4.    2000
 Discuss Question
Answer: Option A. -> 40
Question 366. A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
  1.    5 R
  2.    5 R/4
  3.    4 R/5
  4.    R/5
 Discuss Question
Answer: Option D. -> R/5
Question 367. Which of the following is a good conductor of heat but a bad conductor of electricity ?
  1.    Celluloid
  2.    Rubber
  3.    Asbestos
  4.    Mica
 Discuss Question
Answer: Option D. -> Mica
Question 368. When a number of resistors are connected in series in a circuit, the value of current:
  1.    Increases
  2.    Becomes half
  3.    Decreases
  4.    Remains the same
 Discuss Question
Answer: Option D. -> Remains the same
Question 369. A good conductor while carrying current is
  1.    Alternately charged positive and negative
  2.    Negatively charged
  3.    Positively charged
  4.    Electrically neutral
 Discuss Question
Answer: Option B. -> Negatively charged
Question 370. Water cannot be used to extinguish fire caused by electric current, because
  1.    It may cause electrocution
  2.    It may cause hydrolysis
  3.    It may cause electrolysis
  4.    It may spoil the wiring
 Discuss Question
Answer: Option A. -> It may cause electrocution

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