Physics Test 23

Result

Physics Test 23

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Weekly Quiz Competition

Question 1
4 / -1

A nucleus with Z = 92 emits the following in a sequence; α, α, β⁻, β⁻, α, α, α, α, β⁻, β⁻, α, β⁺, β⁺, α. The Z of the resulting nucleus is

A
76

B
78

C
82

D
74

Solution

The Z of resultant nucleus = 92 − 16 + 4 − 2 = 78
Hence, option B is correct.
Question 2
4 / -1

During the propagation of electromagnetic waves in a medium:

A
Electric energy density is equal to the magnetic energy density

B
Both electric and magnetic energy densities are zero.

C
Electric energy density is double of the magnetic energy density

D
Electric energy density is half of the magnetic energy density

Solution

Energy of the wave is equally distributed in two fields.
Hence, option A is correct.
Question 3
4 / -1

An electric-dipole is placed at an angle of 30 º to a non-uniform electric field. The dipole will experience

A
a torque only

B
a translational force only in the direction of the field

C
a translational force only in a direction normal to the direction of the field

D
a torque as well as a translational force

Solution

The two equal and opposite charges will experience a force due to the electric field. Due to the orientation and changing value of the electric field, the dipole will undergo rotational as well as translational motion.