Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Field lines are shown close together where the

The wavelength of sodium light in air is 5890 Å. The velocity of light in air is 3  The wavelength of light in a glass of refractive index 1.6 would be close to

(a) 5890 Å

(b) 3681 Å

(c) 9424 Å

(d) 15078 Å

Which color band in the resistor is having highest tolerance?

An electric dipole of moment  p is placed in the position of stable equilibrium in uniform electric field of intensity E. It is rotated through an angle θ from the initial position. The potential energy of electric dipole in the final position is

(a) pEcosθ

(b) pEsinθ

(c) pE(1- cosθ)

(d) -pEcosθ

In electrolysis, if the duration of the passage of current is doubled, the mass liberated i

(a) Doubled

(b) Halved

(c) Increased four times

(d) Remains the same

The radius of a circular loop is r and a current i  is flowing in it. The equivalent magnetic moment will be

(a) ir

(b) 2πir

(c) iπ

(d)

A very thin film in reflected white light appears:

For the post office box arrangement to determine the value of unknown resistance the unknown resistance should be connected between

(a) B and C

(b) C and D

(c) A and D

(d) B1 and C1

While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure:

1. Larger friction.
2. Smaller friction.
3. Larger normal force.
4. Smaller normal force.