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PHYSICS MCQs

Total Questions : 3767 | Page 15 of 377 pages
Question 141. A person does some work of 1,000 J in 2 s. His power will be ________
  1.    1000W
  2.    25W
  3.    500W
  4.    50W
 Discuss Question
Answer: Option C. -> 500W
Question 142. Which results in an increase in power?
  1.    Doing more work in less time.
  2.    Doing less work in more time.
  3.    Doing less work in less time.
  4.    Doing more work in more time.
 Discuss Question
Answer: Option A. -> Doing more work in less time.
Question 143. What device converts light energy to electrical energy?
  1.    Photodiode
  2.    Photovoltaic cell
  3.    Thermocouple
  4.    Heliostats
 Discuss Question
Answer: Option B. -> Photovoltaic cell
Question 144. In a water lifting electric pump, we convert
  1.    Electrical energy into Potential energy
  2.    Kinetic energy into Electrical energy
  3.    Kinetic energy into Potential energy
  4.    Electrical energy into Kinetic energy
 Discuss Question
Answer: Option A. -> Electrical energy into Potential energy
Question 145. The device which converts sound energy into electrical energy is called
  1.    Amplifier
  2.    Speaker
  3.    Microphone
  4.    Transmitter
 Discuss Question
Answer: Option C. -> Microphone
Question 146. What is the SI unit of Power?
  1.    Boyle
  2.    Watt
  3.    Newton
  4.    Pascal
 Discuss Question
Answer: Option B. -> Watt
Question 147. For which one of the following does the centre of mass lie outside the body?
  1.    A fountain pen
  2.    A cricket ball
  3.    A ring
  4.    A book
 Discuss Question
Answer: Option C. -> A ring
Question 148. Fat can be seperated from milk in a cream seperator because of :
  1.    Cohesive Force
  2.    Gravitational Force
  3.    Centripetal Force
  4.    Centrifugal Force
 Discuss Question
Answer: Option D. -> Centrifugal Force
Question 149. When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is
  1.    Below a certain minimum value irrespective of amount of water in the pail
  2.    Above a certain minimum value irrespective of amount of water in the pail
  3.    Above a certain minimum value depending on amount of water in the pail
  4.    Below a certain minimum value depending on amount of water in the pail
 Discuss Question
Answer: Option B. -> Above a certain minimum value irrespective of amount of water in the pail
Question 150. In case of uniform circular motion, the acceleration is
  1.    Variable in magnitude but constant in direction
  2.    Constant in magnitude and directed radially inwards
  3.    Variable in magnitude but tangential to the circle
  4.    Zero
 Discuss Question
Answer: Option A. -> Variable in magnitude but constant in direction

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