Kpk Physics 2014 — Solved MCQs

Question 1

An electron volt is a unit of.

Accepted Answer

A. Energy — An electron volt (eV) is a unit of energy.

Question 2

1/(4pi*epsilon_{0}) =

Accepted Answer

C. 9 * 10-12 N * m ^ 2 * C ^ - 2 — Its value is approximately 8.854×10-12 farads per meter (F/m).

Question 3

Ohm's law is valid only for currents flowing in

Accepted Answer

C. Metallic conductors — Ohm's law is valid only for currents flowing in metallic conductors.

Question 4

The unit of magnetic flux density is

Accepted Answer

D. All of these — The unit of magnetic flux density are Tesla (T), "Wb/m²" (Weber per square meter) and "N·A^-1·m^-1" (Newton per ampere per meter)

Question 5

The value of e/m for an electron is

Accepted Answer

B. 1.7588 * 10 ^ 11 — The value of e/m​ for an electron, where e is the elementary charge and m is the mass of the electron, is approximately 1.758820024×1011coulombs per kilogram (C/kg)

Question 6

The induced emf lasts as long as the flux is_

Accepted Answer

C. Changing — The induced electromotive force (emf) lasts as long as the flux is changing.

Question 7

Self inductance "L" of a solenoid

Accepted Answer

C. None of these — The self-inductance (L) of a solenoid, which is a coil of wire wound in the form of a helix, can be calculated using the formula:L=μ0⋅N2.A/l

Question 8

which one of the given series of hydrogen spectrum lies in the ultra - violet region?

Accepted Answer

D. Lyman — The series of spectral lines in the Lyman series of the hydrogen spectrum lies in the ultraviolet region.

Question 9

1 cycle=

Accepted Answer

B. 2pi radians — One cycle corresponds to 2π radians. This relationship arises from the fact that one complete cycle of a periodic function represents a full rotation around a circle, which is 360∘ or 2π radians.

Question 10

Tensile stress is force per unit_

Accepted Answer

A. Area — Tensile stress is the force per unit area

Question 11

Diamagnetic material is

Accepted Answer

B. Repelled — Diamagnetic materials are weakly repelled by magnetic fields.

Question 12

curve is graph between

Accepted Answer

A. Voltage and time — A curve is typically a graph between:Voltage and TimeVoltage and CurrentCurrent and Time

Question 13

In a photovoltaic cell the current generated proportional to the _of incident light.

Accepted Answer

C. Intensity — In a photovoltaic cell, the current generated is directly proportional to the intensity of incident light.

Question 14

The rest mass of photon is.

Accepted Answer

B. Zero — The rest mass of a photon is zero. Photons are massless particles that travel at the speed of light (ccc) in a vacuum. While they have energy and momentum, they do not possess rest mass.

Question 15

The Compton wave length of electron is equal to

Accepted Answer

D. 2.43×10-12m — The Compton wavelength of an electron is approximately 2.426×10-12 meters.

Question 16

Laser is a device which can produce

Accepted Answer

C. all of these — A laser is a device that can produce coherent and focused light beams.

Question 17

paturally cocurring uranium the percentage of

Accepted Answer

D. 001%

Question 18

Leptons are particles that do not experience

Accepted Answer

C. Strong nuclear force — Leptons are particles that do not experience the strong nuclear force.

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