An uncharged metal sphere is placed between two equal and oppositely charged metal plates. The nature of lines of force will be ______________

(a)

(b)

(c)

(d)

An unknown resistance is connected in parallel with a 15\(\Omega \) resistance and a 12V battery. What is the value of the unknown resistance if the current in the circuit is 2A?

(a)

\(10\Omega \)

(b)

\(20\Omega \)

(c)

\(30\Omega \)

(d)

\(40\Omega \)

Consider the motion of a charged particle in a uniform magnetic field directed into the paper. If velocity v of the particle is in the plane of the paper, the charged particle will describe a _____________.

(a)

straight line

(b)

circle

(c)

ellipse

(d)

hyperbola

In the following figure the key is dosed. Which statement is correct?

(a)

momentary current flows in Y circuit from B to A

(b)

momentary current flows in Y circuit from A to B

(c)

no current flows along AB

(d)

the coil Y is attracted to X

If the velocity of light in a medium is 2.25 x 10⁸ ms^-1 then the refractive index of the medium will be _______________.

(a)

1.5

(b)

0.5

(c)

1.33

(d)

1.73

The light reflected by plane mirror may form a real images ____________.

(a)

If the rays incident on the mirror are diverging

(b)

If the rays incident on the mirror are converging

(c)

If the object is placed very close to mirror

(d)

Under no circumstance

A photon of energy hv is absorbed by a free electrons of a metal having work function ф < hv _____________.

(a)

The electron is sure to come out

(b)

The electron is sure to come out with a kinetic energy ф < hv

(c)

Either the electron does not come out or it comes out with kinetic energy hv - ф

(d)

It may come out with a kinetic energy less than hv - ф

The fig. represents the observed intensity of X-rays emitted by an X-ray tube as a function of wavelength. The sharp peaks A and B denote ____________.
 

(a)

continuous spectrum

(b)

band spectrum

(c)

characteristic spectrum

(d)

white radiations

For a transistor \(\frac{I_C}{I_E}\) = 0.96, then CE current gain is ______________.

(a)

12

(b)

6

(c)

24

(d)

48

The made of propagation used by short wave broadcast services is _______________.

(a)

space wave

(b)

skywave

(c)

ground wave

(d)

both (a) & (c)