10th Class Physical Science Quiz

An unknown circuit draws a current of 2 A from 12 V battery. Its equivalent resistance is ---- Ohms.

• 24

• 6

• 12

• 2

The radius of curvature of a spherical mirror is 20 cm. What is the focal length?

• 10 cm

• 40 cm

• 12 cm

• 20 cm

For which mirror (s) the magnification is always 1.

• i only

• Iii only

• Ii only

• i and ii only

Identify the applications of total internal reflection among the following

• both iv and i

• both iii and iv

• both ii and iii

• both i and ii

A current flows in a conductor from east to west the direction of the magnetic field a point above the conductor is

• towards east

• towards south

• towards north

• towards west

A ray which seems to be travelling through the focus of a concave mirror passes – after reflection

• Parallel to the axis

• Along the same path in opposite direction

• Through the Focal point

• Through the Center of Curvature

The change in focal length of an eye lens is caused by the action of the ____

• Ciliary muscles

• Iris

• Retina

• Pupil

If Same amount of heat is supplied to water and oil then

• i, iv are correct

• Ii, iv are correct

• i, iii are correct

• Ii, iii are correct

Identify the type(s) of mirror produces an image that is always the same height as the object, and always virtual?

• both i and ii only

• iii only

• ii only

• i only

Raju wants to measure the specific heat of Lead ball. Which of the following instrument is needed to do this experiment?

• Barometer

• Bomb Calorimeter

• Calorimeter

• Hydrometer