Electric Charges and Fields — Physics STD 12 Science — Question

The contact angle between as solid and a liquid is a property of:

1. The material of the solid.
2. The material of the liquid.
3. The shape of the solid.
4. The mass of the solid.

The materials which allow to pass electricity through them easily are called as:

The term on the RHS of the Gauss’s law shows the:

A parallel plate capacitor is made by stacking n equally spaced plates connected alternately. If the capacitance between any two plates is  C then the resultant capacitance is

(a) C

(b) nC

(c) (n – 1)C

(d) (n + 1)C

What is the effect on null deflection of galvanometer, when the radius of the wire is tripled?

 What is the full form of UHF?

Why does light travel as a wave?

A 60 watt bulb is hung over the center of a table 4 m × 4 m at a height of 3 m. The ratio of the intensities of illumination at a point on the centre of the edge and on the corner of the table is

(a)

(b) 2 / 1

(c) 17 / 13

(d)  5 / 4

The resistance of a wire of iron is 10 ohms and temp. coefficient of resistivity is  5 . At  20 it carries 30 milliamperes of current. Keeping constant potential difference between its ends, the temperature of the wire is raised to 120. The current in milliamperes that flows in the wire is

(a) 20

(b) 15

(c) 10

(d) 40