SA-2 Physics Revision

Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli are, respectively

• plane mirror and convex mirror

• plane mirror and concave mirror

• concave mirror and convex mirror

• None of these

Changing of right side to left is called …………………..

You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either

• concave mirror or convex lens

• concave mirror or convex mirror

• concave mirror or concave lens

• concave lens or convex lens

Angle between incident ray and reflected ray is double that of the angle of incidence.

• True

• False

A simple pendulum takes 32s to complete 20 oscillations, what is the time period of the pendulum?

• 1.8seconds

• 1 minute

• 1.5 seconds

• 1.6 seconds

Which of the following are not correct?

(i) The basic unit of time is second.

(ii) Every object moves with a constant speed.

(iii) Distances between two cities are measured in kilometers.

(iv) The time period of a given pendulum is not constant.

(v) The speed of a train is expressed in m/h

• (i), (ii), (iv)

• None of the above

• (ii), (iv), (v)

• (ii)and (iv) only

Which of the following relations is correct?

• Speed = Distance/Time

• Speed – Time/Distance

• Speed = Distance× Time

Study the graph given above . What can be concluded about the speed in the above graph?

• It increases first and then becomes constant but not zero.

• It goes on increasing

• It decreases first and then becomes zero

When an electric current passes through a solenoid, it acts as a/an

• Insulater

• electric bell

• Resister

• bar magnet

The strength of the magnetic field due to a solenoid can be increased by

• decreasing the current strength in the solenoid

• increasing the number of turns in the solenoid

• by winding solenoid around a plastic rod

• All of the above