1st Semester Physics Important Questions

1st Semester Physics Important Questions. We covered all the 1st Semester Physics Important Questions in this post for free so that you can practice well for the exam.

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1st Semester Physics Important Objective Questions for Students

A wheel has a mass of 50 kg and a radius of gyration of 1 meter. It is brought to rest from a speed of 1800 rpm in 30 seconds by uniform retarding torque. The torque is:

a. 314 N-m

b. 530 N-m

c. 613 N-m

d. 222 N-m

Option a – 314 N-m

A flywheel is in the form of a uniform circular disc with a radius of 1 meter and a mass of 2 kg. The work done on the flywheel to increase its frequency of rotation from 5 to 10 rev/sec is:

a. 7489 J

b. 1479 J

c. 513 J

d. 214 J

Option b – 1479 J

If the radius of the Earth, assumed to be a perfect sphere, suddenly shrinks to half its present value while the mass of the Earth remains unchanged, what will be the duration of one day?

a. 2 hours

b. 4 hours

c. 6 hours

d. 8 hours

Option c – 6 hours

A particle is at rest in a rotating frame. The pseudo force acting on the particle in the rotating frame is:

a. Zero

b. Only the centrifugal force

c. Only the Coriolis force

d. The combination of both centrifugal and Coriolis forces

Option b – Only the centrifugal force

We covered all the 1st semester physics important questions above in this post for free so that you can practice well for the exam.

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