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

If potential  V = 100 ± 0.5 Volt and current I = 10  ± 0.2 amp are given to us.  Then what will be the value of resistance

(a) 10 ± 0.7 ohm

(b) 5 ± 2 ohm

(c) 0.1 ± 0.2 ohm

(d) None of these

The heat produced by a 100 watt heater in 2 minute will be equal to

(a) 12

(b) 10

(c) 6

(d) 3

The state of the energy gained by valance electrons when the temperature is raised or when electric field is applied is called as

(a) Valance band

(b) Conduction band

(c) Forbidden band

(d) None of these

What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000   is used and slit width is 12 

(a) 2 rad

(b) 3 rad

(c) 1 rad

(d) 8 rad

Two infinite length wires carries currents 8A and 6A respectively and placed along X and Y-axis. Magnetic field at a point P(0, 0, d)m will be

(a)

(b)

(c)

(d)

A motor car is going due north at a speed of 50km/h. It makes a 90° left turn without changing the speed. The change in the velocity of the car is about:

1. 50km/h towards west.
2. 70km/h towards south-west.
3. 70km/h towards north-west.
4. zero.

The unit of specific resistance is:

According to the Heisenberg uncertainty principle:

A region surrounding a stationary electric dipoles has

(a) Magnetic field only	(b) Electric field only
(c) Both electric and magnetic fields	(d) No electric and magnetic fields

A square of side ‘a’ has charge Q at its centre and charge ‘q’ at one of the corners. The work required to be done in moving the charge ‘q’ from the corner to the diagonally opposite corner is

(a) Zero

(b)

(c)

(d)