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Physics Past Questions and Answers

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Physics Questions

Question 611:

What precaution should a manufacturer take to ensure that energy loss in a transformer is minimized?

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A The winding of the transformer should be made of high resistance wire
B The core should be made of thin sheets of metal
C No magnetic material should be used to make the core
D The flux linking the primary with the secondary coils should be minimum

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Question 612:

A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?

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A 200
B 1200
C 1600
D 2400

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Question 613:

The photocell works on the principle of the

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A Voltaic cell
B Emision of electrons by incident radiation
C Emision of protons by incident electrons
D Photographic plate

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Question 614:

What is the reading of the vernier scale above

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A 1.88cm
B 1.80cm
C 1.28cm
D 1.97cm

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Question 615:

Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is

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A 2âˆš3/3N
B √2N
C 4âˆš3/3
D 2V3N

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