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1.

In Young's double-slit experiment, the central point on the screen is

A) bright

B) dark

C) First bright and then dark

D) first dark and then bright

2.

In Young's double-slit experimental setup if the wavelength alone is doubled, the bandwidth β becomes

A) $\frac{\beta}{2}$

B) $2\beta$

C) $3\beta$

D) $\beta$

3.

The work done by an uniform magnetic field on a moving charge is

A) zero because $\overrightarrow{F}$ acts parallel to $\overrightarrow{v}$

B) positive because $\overrightarrow{F}$ acts perpendicular to $\overrightarrow{v}$

C) zero because $\overrightarrow{F}$ acts perpendicular to $\overrightarrow{v}$

D) negative because $\overrightarrow{F}$ acts parallel to $\overrightarrow{v}$

4.

The current in the 1Ω resistor shown in the circuit is

A) $\frac{2}{3}$ A

B) 3A

C) 6A

D) 2A

5.

Tube A has both ends open while tube B has one end closed, otherwise, they are identical. The ratio of the fundamental frequency of tube 'A and B' is

A) 1 : 2

B) 1 : 4

C) 2 : 1

D) 4 : 1

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