Physics Test 142

Result

Physics Test 142

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Weekly Quiz Competition

Question 1
4 / -1

In the circuit shown below, the key K is closed at t = 0. The current through the battery is

A

B

C

D

Solution
Question 2
4 / -1

A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is The magnetic induction (B) along z-axis is

A

B

C

D

Solution

Velocity of light
Question 3
4 / -1

A lens made of glass whose index of refraction is 1.60 has a focal length of + 20 cm in air. Its focal length in water, whose refractive index is 1.33, will be

A
three times longer than in air

B
two times longer than in air

C
same as in air

D
None of these

Solution
Question 4
4 / -1

In Young's double slit experiment shown in figure S₁ and S₂ are coherent sources and S is the screen having a hole at a point 1.0mm away from the central line. White light (400 to 700nm) is sent through the slits. Which wavelength passing through the hole has strong intensity?

A
400nm

B
700nm

C
500nm

D
667nm

Solution

Wavelength for which maximum obtained at the hole has the maximum intensity on passing. So,
Question 5
4 / -1

The maximum velocity of an electron emitted by light of wavelength λ incident on the surface of a metal of work function is

A

B

C

D

Solution
Question 6
4 / -1

Ionization potential of hydrogen atom is 13.6eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr’s theory, the spectral lines emitted by hydrogen will be

A
Three

B
Four

C
One

D
two

Solution

Energy of ground state 13.6 eV Energy of first excited state
Question 7
4 / -1

A
0.51 MeV

B
7.10 MeV

C
6.30 MeV

D
5.4 MeV

Solution
Question 8
4 / -1

A working transistor with its three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q . By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?

A
It is an npn transistor with R as base

B
It is a pnp transistor with R as base

C
It is a pnp transistor with R as emitter

D
It is an npn transistor with R as collector

Solution

It is a p-n-p transistor with R as base.
Question 9
4 / -1

What is the modulation index of an over modulated wave

A
1

B
Zero

C
<1

D
>1

Solution
Question 10
4 / -1

In the figure shown the wave speed is v. The velocity of car is V₀. The beat frequency for the observer will be

A

B

C

D

Solution