Kpk Physics 2016 — Solved MCQs

Question 1

Pair production occurs only when energy of photon is at least equal to....

Accepted Answer

B. B.1.02Mev — pair production occurs only when the energy of the photon is at least equal to 2×0.511 MeV=1.022 MeV

Question 2

Current in semi conductor is caused by the movement of_

Accepted Answer

A. Both electrons an holes — In a semiconductor, current is primarily caused by the movement of charge carriers. These charge carriers can be either electrons (negative charge) or holes (positive charge).

Question 3

The phase difference between the current and voltage at resonance

Accepted Answer

A. pi — phase difference between the current and voltage at resonance in an RLC circuit is 90∘.

Question 4

Lenz's Law a consequence of the law of conservation of_

Accepted Answer

A. Energy — Lenz's Law is a consequence of the law of conservation of energy

Question 5

Unit of decay constant is_

Accepted Answer

A. S-1 — For radioactive decay, which is a common context where decay constant is used, the unit of decay constant is usually reciprocal time units, such as:per second (s⁻¹)

Question 6

The sinusoidal alternating voltage can be expressed by the equation

Accepted Answer

C. V0sin⁡(ωt+ϕ) — The expression for a sinusoidal alternating voltage can be given by:V(t)=V0sin⁡(ωt+ϕ)

Question 7

Both the length and radius of a rod are doubled. Then to act the modulus of elasticity will_

Accepted Answer

B. Remains same — When both the length and radius of a rod are doubled, the modulus of elasticity remains the same.

Question 8

Most of the electrons in the base of a NPN transistor flow_ into

Accepted Answer

C. emitter Into the collector — Most of the electrons in the base of an NPN transistor flow from the emitter into the collector.

Question 9

A perfect absorber must also be a perfect

Accepted Answer

C. Emitter — A perfect absorber must also be a perfect emitter

Question 10

The unit of magnetic flux

Accepted Answer

A. .A.Weber — The unit of magnetic flux is the weber (Wb).

Question 11

When area A is normal to the Electric field E then electric flux

Accepted Answer

A. .Maximum — When the area A is normal to the electric field E, the electric flux is maximized

Question 12

The charge of electron was determined by the effect of electrical field on rate of fall of all droplets under gravity. This was done

Accepted Answer

C. C.R.Milikan — The charge of the electron was determined by the oil drop experiment conducted by Robert Millikan in 1909

Question 13

Which one of the given quantities remain constant in step up transformer?

Accepted Answer

B. B.Power — In a step-up transformer, the quantity that remains constant is the power (ignoring losses).

Question 14

Bottom quark represents _ charge value

Accepted Answer

D. 1. 1/3 * e — The bottom quark, also known as the beauty quark, has an electric charge of -1/3e, where "e" represents the elementary charge.

Question 15

K Wh=....

Accepted Answer

C. C.3.6x106J — 1 kilowatt-hour is equal to 3600 kilojoules.

Question 16

A photon while passing through a magnetic field is deflected towards

Accepted Answer

D. None of these ( — photons do not deflect toward any specific pole (north or south) when passing through a magnetic field. The deflection of charged particles in a magnetic field depends on their charge and the orientation of the magnetic field, but photons, being electrically neutral, do not experience such deflection.

Question 17

insulator the conduction band.is

Accepted Answer

B. B.Partially — In an insulator, the conduction band is typically empty or only partially filled.

Question 18

According to classical physics

Accepted Answer

D. D.All of these — absolute space is an independent and unchanging framework against which motion occurs. classical physics posits the existence of absolute time, which flows uniformly and independently of any observer or external factors.mass is considered an intrinsic property of matter that remains constant unless acted upon by an external force

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