Physics Test 147

Result

Physics Test 147

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Weekly Quiz Competition

Question 1
4 / -1

Charge is distributed within a sphere of radius R with a volume charge density where A and a are constants. If Q is the total charge of this charge distribution, the radius R is :

A

B

C

D

Solution
Question 2
4 / -1

When the switch S, in the circuit shown, is closed, then the value of current i will be :

A
3A

B
5A

C
4A

D
2A

Solution
Question 3
4 / -1

In the figure shown, after the switch 'S' is turned from position 'A' to position 'B', the energy dissipated in the circuit in terms of capacitance 'C' and total charge 'Q' is:

A

B

C

D

Solution
Question 4
4 / -1

A solid metal cube of edge length 2 cm is moving in a positive y direction at a constant speed of 6 m/s. There is a uniform magnetic field of 0.1 T in the positive z-direction. The potential difference between the two faces of the cube perpendicular to the x-axis, is :

A
6 mV

B
1 mV

C
12 mV

D
2 mV

Solution
Question 5
4 / -1

If the magnetic field of a plane electromagnetic wave is given by

(The speed of light = 3 × 10⁸m/s)
B=100 × 10^–6 sin then the maximum electric field associated with it is :

A
4 × 10⁴ N/C

B
4.5 × 10⁴ N/C

C
6 × 10⁴ N/C

D
3 × 10⁴ N/C

Solution

E₀ = B₀ × C

= 100 × 10^–6 × 3 × 10⁸

= 3 × 10⁴ N/C

∴ correct answer is 3 × 10⁴ N/C
Question 6
4 / -1

In a Young’s double slit experiment, I₀ is the intensity at the central maximum and β is the fringe width. The intensity at a point P distance x from the centre will be-

A
I₀ cos

B
4I₀ cos²

C
I₀ cos²

D
I₀/4 cos²

Solution
Question 7
4 / -1

The maximum number of possible interference maxima for slit separation equal to 1.8 λ, where λ is the wavelength of light, in a Young's double slit experiment is :-

A
Infinite

B
Zero

C
5

D
3
Question 8
4 / -1

The optic axis of a thin equiconvex lens is the x-axis. The co-ordinates of a point object and its image are (–40 cm, 1 cm) and (50 cm, –2 cm) then the position of the lens will be :-

A
x = + 20 cm

B
x = – 30 cm

C
x = – 10 cm

D
origin
Question 9
4 / -1

A glass prism of refractive index 1.5 is immersed in water (refractive index 4/3) as shown in the figure. A light beam incident normally on the face AB is totally reflected to reach the face BC, if:-

A
sin θ > 5/9

B
sin θ > 1/3

C
sin θ > 2/3

D
sin θ > 8/9
Question 10
4 / -1

In the circuit shown, the diode is ideal. The potential of A is higher than the potential of B. If the switch S is closed, the equivalent resistance between A and B is :-

A
R

B
R/2

C
R/3

D
R/4

Solution

Rearranging the circuit as shown, current can flow from A to B through the R resistor only if the switch S is closed. In this case R_AB = R/4