Physics Test 143

Result

Physics Test 143

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Weekly Quiz Competition

Question 1
4 / -1

A 2 μC charge moving around a circle with a frequency of produces a magnetic field 6.28 tesla at the centre of the circle. The radius of the circle is

A
2.25m

B
0.25m

C
13.0m

D
1.25m

Solution

Magnetic field at the centre of the current loop is
Question 2
4 / -1

The figure shows the various positions (labelled by subscripts) of small magnetised needles P and Q . The arrows show the direction of their magnetic moment. Which configuration corresponds to the lowest potential energy among all the configurations shown?

A
PQ₃

B
PQ₄

C
PQ₅

D
PQ₆

Solution

PQ₆corresponds to the lowest potential energy among all the configurations shown.
Question 3
4 / -1

A square loop of side a is rotating about its diagonal with angular velocity ω in a perpendicular magnetic field. It has 10 turns. The emf induced is

A

B

C

D

Solution
Question 4
4 / -1

The voltage time (V-t) graph for triangular wave having peak value V₀ is as shown in figure. The rms value of V in time interval from t = 0 to T/4 is then find the value of x.

A
5

B
4

C
7

D
3

Solution
Question 5
4 / -1

During the propagation of electromagnetic waves in a medium:

A
Electric energy density is double of the magnetic energy density.

B
Electric energy density is half of the magnetic energy density.

C
Electric energy density is equal to the magnetic energy density.

D
Both electric and magnetic energy densities are zero.

Solution
Question 6
4 / -1

A light ray falls on a rectangular glass slab as shown. The index of refraction of the glass, if total internal reflection is to occur at the vertical face, is

A

B

C

D

Solution
Question 7
4 / -1

In Young’s double slit experiment, the separation between the slits is halved and the distance between the slits and screen is doubled. The fringe width will

A
be halved

B
be doubled

C
be quadrupled

D
remain unchanged

Solution
Question 8
4 / -1

When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is:

A
0.65 eV

B
1.0 eV

C
1.3 eV

D
1.5 eV

Solution
Question 9
4 / -1

An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, the value of n is

A
3

B
4

C
5

D
2

Solution
Question 10
4 / -1

A radioactive nucleus undergoes a series of decay according to the scheme

If the mass number and atomic number of ‘A’ are 180 and 72 respectively, then what are these numbers for A₄

A
172 and 69

B
174 and 70

C
176 and 69

D
176 and 70

Solution