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PHYSICS MCQs

Total Questions : 3767 | Page 52 of 377 pages
Question 511. Working of safety fuses depends upon1. magnetic effect of the current2. chemical effect of the current3. magnitude of the current4. heating effect of the currentSelect the correct answer using the code given below.
  1.    1, 2, 3 and 4
  2.    1, 2 and 3 only
  3.    3 and 4 only
  4.    4 only
 Discuss Question
Answer: Option C. -> 3 and 4 only
Question 512. During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to
  1.    Remain in the car
  2.    Get out of the car and lie flat in the ground
  3.    Abandon the car and take shelter under a nearby tree
  4.    Touch the nearest electric pole
 Discuss Question
Answer: Option A. -> Remain in the car
Question 513. Safety fuse wire used in domestic electrical appliances is made of metal of low
  1.    Resistance
  2.    Melting point
  3.    Specific gravity
  4.    Conductance
 Discuss Question
Answer: Option B. -> Melting point
Question 514. The unit of electrical power is
  1.    Bolt
  2.    Watt
  3.    Kilowatt hour
  4.    Ampere
 Discuss Question
Answer: Option B. -> Watt
Question 515. The best conductor of electricity among the following is :
  1.    Copper
  2.    Iron
  3.    Aluminium
  4.    Silver
 Discuss Question
Answer: Option D. -> Silver
Question 516. Kilowatt-hour is the unit of :
  1.    Energy
  2.    Power
  3.    Force
  4.    Momentum
 Discuss Question
Answer: Option A. -> Energy
Question 517. The earth-wire of a cable is connected to
  1.    The outer metallic body of the appliance
  2.    The fuse of the appliance
  3.    The filament of the appliance
  4.    Short circuitry of the appliance
 Discuss Question
Answer: Option B. -> The fuse of the appliance
Question 518. Copper wires are generally used for electrical power transmission instead of iron wire because :
  1.    Copper is cheaper than iron
  2.    Copper is lighter than iron
  3.    Copper is a better conductor of electricity than iron
  4.    Copper can take higher power than iron
 Discuss Question
Answer: Option C. -> Copper is a better conductor of electricity than iron
Question 519. Lightning is caused due to
  1.    Electric power
  2.    Electric discharge
  3.    Electric leak
  4.    Electric pressure
 Discuss Question
Answer: Option B. -> Electric discharge
Question 520. Lightning is produced when
  1.    Similar charges of electricity rush towards each other and then get repelled
  2.    Clouds strike against impurities in air and the friction burns up these impurities
  3.    Strong opposite charges in different clouds break down the resistance offered by the intervening air
  4.    Water vapour produces electricity in the clouds
 Discuss Question
Answer: Option C. -> Strong opposite charges in different clouds break down the resistance offered by the intervening air

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