Physics Past Questions and Answers

When a red rose flower is observed in blue light, what colour does the observer see?

A Red
B Blue
C Magenta
D Yellow
E No correct option

Question 27:

The capacitance of a parallel plate capacitor is 20 Î¼f in air and 60 Î¼f in the presence of a dielectric. What is the dielectric constant?

A 0.3
B 6.0
C 3.0
D 2.0

Question 28:

A certain far - sighted person cannot see object that are closer to the eye than 50 cm clearly. Determine the power of the converging lens which will enable him to see at 25 cm

A 0.06 D
B 0.02 D
C 0.03 D
D 0.04 D
E No option is correct

Question 29:

The eclipse of the sun occurs when the

A Moon is between the sun and the earth
B Earth is between the sun and the moon
C Moon is not completely hidden in the earth's shadow
D Moon's umbra falls on some part of the earth

Question 30:

Which of the following is a property of steel?

A It cannot retain its magnetism longer than iron
B It can be used for making temporary magnets
C It can be used for making permanent magnets
D It can easily be magnetized and demagnetized