Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

861.

In the diagram above, the direction of the force between N and S in the magnetic field is

A.

MP

B.

SN

C.

NS

D.

PM

Correct answer is C

No explanation has been provided for this answer.

862.

From the diagram above, the measuring accuracy of the micrometer screw gauge is

A.

4.78mm

B.

4.16mm

C.

4.66mm

D.

4.70mm

Correct answer is B

No explanation has been provided for this answer.

863.

In the diagram above, the neutral point is at

A.

R

B.

X

C.

S

D.

P

Correct answer is B

No explanation has been provided for this answer.

865.

If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is

A.

10cm

B.

20cm

C.

25cm

D.

15cm

Correct answer is D

M = \(\frac{v}{u}\) = 3 = \(\frac{v}{30}\). V = 30m

\(\frac{1}{u}\) + \(\frac{1}{v}\) = \(\frac{1}{f}\) = \(\frac{1}{10}\) - \(\frac{1}{30}\) = \(\frac{1}{f}\)

\(\frac{3 - 1}{30}\) = \(\frac{1}{f}

f = \(\frac{30}{2}\) = 15cm