NEB Class 12 Board Exam 2079/80 Physics MCQs Solutions

 NEB Class 12 Board Exam 2079/80 Physics MCQs Solutions

A. Physics Exam 2080 General Stream MCQs (1021 'R') (Correct answer in RED color)

1. When the torque acting upon a system is zero which of the following will be a constant?

a. Force

b. Linear momentum

c. Angular momentum

d. Angular acceleration

2. A particle executes SHM. Its initial position is the mean position. The kinetic energy of a particle against time period is represented by the curve.

A. Correct

B.

C.

 

D.

3. Bernoulli's Principle is based on the law of conservation of

a. mass

b. energy

c. linear momentum

d. angular momentum

4. An ideal gas is taken through series of changes represented in the diagram below. The net work done by the gas at the end of the cycle is equal to

a. P₁V₁

b. 12 P₁V₁      

c. 6 P₁V₁

d. 3 P₁V₁

5. What is the significance of the Clausius statement of the second law of thermodynamics?

a. Defines the maximum theoretical efficiency of a heat engine.

b. States that heat cannot spontaneously flow from a colder object to a hotter object.

c. Describes the relationship between entropy and the reversibility of a process

6. If the source of sound and the listener move in the same direction with same velocity equal to half the velocity of sound, what is the change in the frequency?

a. 0%

b. 25%

c. 50%

d. 100%

7. The given figure represents a wavefront AB moving in air and incident on a plane glass surface XY. Its position after refraction through the glass slab is CD. The refractive index of glass with respect to air will be equal to:

a. AB/CD

b. BD/AD

c. AC/AD

d. BD/AC

8. Self inductance of a coil varies as

a. Reciprocal of number of turns

b. Resistance of the coil

c. Square of number of turns

d. Magnitude of current flowing

9. The region of initiation of Seismic energy within the earth is called

a. Epicenter

b. Hypocenter

c. Pole

d. Optic center

10. P-waves are

a. Longitudinal

b. Transverse

c. Electromagnetic

d. Ultrasonic

11. Kirchhoff's voltage law of electrical circuits is based on the principle of conservation of

a. charge

b. mass

c. energy

d. linear momentum

B. Physics Exam 2080 General Stream (1021 'P') (Correct answer in RED color)

1. Which quantity in rotational motion is analogous to force in linear motion?

a. Torque

b. Moment of inertia

c. Angular velocity

d. Angular momentum

2. A particle undergoes SHM having time period T. What is the time taken by it to move from mean position to half of amplitude?

a. T/2

b. T/3

c. T/6

d. T/12

3. Two capillary tubes of A and B of radii 2mm and 4mm are dipped in the same liquid. What is the ratio of heights through which liquid rises in tubes A and B?

a. 1:2

b. 2:1

c. 1:4

d. 4:1

4. An ideal liquid is taken through series of changes represented in diagram. The work done by the gas at the end of cycle is

a. P₁V₁

b. 5P₁V₁     

_c. 10P₁V₁

_{d. Zero}

_{5. A Carnot engine is working between 300K and 600K has output 200J. What is the energy supplied to the engine?}

_{a. 400J}

_{b. 800J}

_{c. 1200J}

_{d. 1600J}

_{6. The frequency of tunning fork is 384Hz and velocity of sound in air is 352 m/s. How far the sound has transversed while fork complete 36 vibrations?}

_{a. 33m}

_{b. 36m}

_{c. 352m}

_{d. 72m}

_{7. A ray of light strikes a glass plate at an angle of incidence  . If the reflected and refracted rays are perpendicular to each other in interface, what is the refractive index of glass?}

_a. 1/√3

_b. √3/2

_c. 2/√3

_d. √3   

^{8. Which of the following is the phenomenon of production of emf by maintaining a difference of temperature between two junctions of dissimilar metals?}

^{a. Joule's effect}

^{b. Seebeck effect}

^{c. Peltier effect}

^{d. Thomson's effect}

^{9. What happens to the susceptibility of ferromagnetic substance if temperature is decreased?}

^{a. Increases}

^{b. Decreases}

^{c. Remains same}

^{d. May increase or decrease}

^{10. What is the induced emf in a coil if the flux associated with it changes at the rate of 1 Weber per minute?}

^{a. 1 Volt}

^{b. 1/60 Volt}

^{c. 60 Colt}

^{d. Zero}

^{11. Which of the Earth quake waves is first recorded on the seismograph?}

^{a. P-waves}

^{b. Rayleigh waves}

^{c. S-waves}

^{d. Love waves}

C. Physics Exam 2080 Technical Stream (9131) (Correct answer in RED color)

1. Two bodies have their moment of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, their angular momentum will be in the ratio of

a. 1:3

b. √2 : 1

c. 2:1

d. 1:√2 (Question had wrong Option)

2. The thermodynamics process in which temperature remains constant is called

a. Isobaric

b. Isothermal

c. Isochoric

d. Adiabatic

3. Internal energy of real gas depends on:

a. Volume and temperature

b. Pressure and Temperature

c. Volume only

d. Temperature only

4. The distance travelled by a wave in one complete cycle is called

a. amplitude

b. wavelength

c. frequency

d. displacement

5. Kirchhoff's current law is based on the principle of conservation of

a. charge

b. mass

c. linear momentum

d. energy

6. The instrument used for the accurate measurement of the emf of a cell is 

a. a voltmeter

b. a potentiometer

c. an ammeter

d. a slide wire bridge

7. Which of the following is ferromagnetic material ?

a. Nickel

b. Bismuth

c. Aluminum

d. Quartz

8. X-rays of wavelength 3Å have a frequency of

a. 10 Hz

b. 10²Hz

c. 1×10⁴Hz

d. 1×10¹⁸Hz

9. The dynamic mass of photon is

a. λ ∕ hc

b. h ∕ λc

c. h² ∕ λc

d. hc ∕ λ

10. As the quantum number increases, the difference in energy  between two consecutive energy levels.

a. remains same

b. decreases

c. increases

d. some times increases and sometimes decreases

11. Holes exists in

a. metals

b. insulators

c. semiconductor

d. conductor