Physics Test

Question 1
1 / -0

In a photoemissive cell, with exciting wavelength λ, the fastest electron has speed v. If the exciting wavelength is changed to \(\frac{3 \lambda}{4}\), the speed of the fastest emitted electrons will be:

A
\(v\left(\frac{4}{3}\right)^{\frac{1 }{ 2}}\)

B
\(v\left(\frac{3}{4}\right)^{\frac{1 }{ 2}}\)

C
less than \(v\left(\frac{4}{3}\right)^{\frac{1 }{ 2}}\)

D
greater than \(v\left(\frac{4}{3}\right)^{\frac{1 }{ 2}}\)

Question 2
1 / -0
Consider the following statements:
1. The shorter length of the potentiometer wire is preferred.
2. Copper wire is used in potentiometers.
3. The electric field inside the potentiometer is variable.
4. If the length of the wire is halved, the position of zero deflection in a potentiometer occurs at a longer length.
Which of the following statement is incorrect?
A
Only 1 and 2

B
Only 2 and 4

C
Only 1 and 4

D
All 1, 2, 3 and 4

Question 3
1 / -0

Ripple factor of a half wave rectifier is:

A
1.21

B
0.08

C
0.61

D
2.14

Question 4
1 / -0

Which of the following material has the highest relative permittivity?

A
Water

B
Transformer Oil

C
Epoxy Resin

D
Mica

Question 5
1 / -0

The number of particles pen unit volume is given by \(n=-\frac{D n_{2}-n_{1}}{x_{2}-x_{1}}\) are crossing a unit area perpendicular to \(x\) -axis in unit time, when \(n_{1}\) and \(n_{2}\) are the number of particles per unit volume for the values \(x_{1}\) and \(x_{2}\) of \(x\) respectively. Then the dimensional formula of diffusion constant D is:

A
\(\left[M^{0} L T^{0}\right]\)

B
\(\left[M^{0} L^{2} T^{-4}\right]\)

C
\(\left[M^{0} L T^{-3}\right]\)

D
\(\left[M^{0} L^{2} T^{-1}\right]\)

Question 6
1 / -0

The time period of a geostationary satellite that moves in a circular orbit around the earth in the equatorial plane is:

A
24 hour

B
20 hour

C
48 hour

D
36 hour

Question 7
1 / -0

Consider the following statements about a microscope and a telescope:

1. Both the eyepiece and the objective of a microscope are convex lenses.

2. The focal length of the objective of a telescope is larger than the focal length of its eyepiece.

3. The magnification of a telescope increases with the increase in focal length of its objective.

4. The magnification of a microscope increases with the increase in focal length of its objective.

Which of the statements given above are correct?

A
1 and 3 only

B
1 and 4

C
2, 3 and 4

D
1, 2 and 3

Question 8
1 / -0

Find the equivalent resistance of the circuit.

A
2 Ω

B
4 Ω

C
6 Ω

D
8 Ω

Question 9
1 / -0

What would be the acceleration due to gravity (in m/s²) of a planet of radius 6000 km, if escape velocity from it is 12 km/s?

A
14

B
9

C
12

D
6

Question 10
1 / -0

Electromagnetic waves are generated by-

A
Static charge

B
Moving charge

C
Accelerated charge

D
None of these

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Physics Test - ...

Question 1

\(v\left(\frac{4}{3}\right)^{\frac{1 }{ 2}}\)

\(v\left(\frac{3}{4}\right)^{\frac{1 }{ 2}}\)

less than \(v\left(\frac{4}{3}\right)^{\frac{1 }{ 2}}\)

greater than \(v\left(\frac{4}{3}\right)^{\frac{1 }{ 2}}\)

Question 2

Only 1 and 2

Only 2 and 4

Only 1 and 4

All 1, 2, 3 and 4

Question 3

1.21

0.08

0.61

2.14

Question 4

Water

Transformer Oil

Epoxy Resin

Mica

Question 5

\(\left[M^{0} L T^{0}\right]\)

\(\left[M^{0} L^{2} T^{-4}\right]\)

\(\left[M^{0} L T^{-3}\right]\)

\(\left[M^{0} L^{2} T^{-1}\right]\)

Question 6

24 hour

20 hour

48 hour

36 hour

Question 7

1 and 3 only

1 and 4

2, 3 and 4

1, 2 and 3

Question 8

2 Ω

4 Ω

6 Ω

8 Ω

Question 9

14

9

12

6

Question 10

Static charge

Moving charge

Accelerated charge

None of these

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