Question 1 :
A ray of light strikes a plane mirror, such that angle of incident ray with the mirror surface is {tex} 30 ^ { \circ } . {/tex} What is the value of angle of reflection? What is the angle between incident ray and reflected ray?
Question 2 :
Looking into a mirror one finds her image diminished, the mirror is
Question 6 :
In case of concave mirror, the minimum distance between an object and its real image is :
Question 7 :
Two plane mirrors are placed making an angle 60 in between them. For an object placed in between the mirrors, the number of images formed will be :
Question 8 :
For an incident ray directed towards centre of curvature of a spherical mirror the reflected ray:
Question 11 :
If an incident ray passes through the centre of curvature of a spherical mirror, the reflected ray will :
Question 12 :
The image formed by a plane mirror has the following characteristic:
Question 13 :
A real and enlarged image can be obtained by using a
Question 14 :
A mirror forms a virtual image (diminished) of an object, whatever be the position of object :
Question 16 :
A concave mirror is made by cutting a portion of a hollow glass sphere of radius 30 {tex} \mathrm{cm} {/tex}. The focal length of the concave mirror is :
Question 18 :
A ray of light is incident on a concave mirror. If it is parallel to principal axis, the reflected ray will :
Question 19 :
A bar magnet is rubbed on a bar of steel along its length 20 times. The bar of steel gets magnetised due to the process of :
Question 20 :
Assuming that the charges of an electron is {tex}1.6 × 10^{-19}{/tex}coulombs, the number of electrons passing through a section of wire per sec, when the wire carries a current of one ampere is :
Question 22 :
Calculate the total number of electrons flowing through a circuit in {tex} 20 \mathrm{mins} {/tex} and {tex} 40 \mathrm{~s} {/tex} if a current of 40{tex}\mu A{/tex} flows through the circuit.<br />({tex} 1 \mathrm{e}^{-}=1.6 \times 10^{-19} \mathrm{C}{/tex})
Question 28 :
The insulator of electricity is which of the following materials listed below:
Question 31 :
On increasing the resistance in a circuit, the current in it
Question 32 :
Current in a circuit flows in which of the following directions listed below:
Question 35 :
In a metallic conductor, electric current is thought to be due to movement of :
Question 39 :
The place around a magnet where its influence can be detected is called :