Important MCQS For Class XII Physics, Solved: Test Yourself From Past SQPs

The CBSE class XII examination is around the corner. Now is not the time to panic, but to focus. Concentrate on your studies, and you will definitely achieve your goal.

At this time, constant revision of what you have studied is crucial.

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The following important Physics class 12 MCQs/ 1 mark questions have been taken from past sample questions papers of CBSE so, rest assured about the authenticity. The answers have been provided at the end.

Q1. The electric potential of earth is taken to be zero because earth is a good

(a) Insulator
(b) conductor
(c) semiconductor
(d) dielectric

Q2. A metallic plate exposed to white light emits electrons. For which of the following colours of light, the stopping potential will be maximum?

(a) Blue
(b) Yellow
(c) Red
(d) Violet

Q3. The electric potential on the axis of an electric dipole at a distance ¡®r from it¡¯s centre is V. Then the potential at a point at the same distance on its equatorial line will be

(i) 2V
(ii) -V
(iii) V/2
(iv) Zero

Q4. Which physical quantity in a nuclear reaction is considered equivalent to the Q- value of the reaction?

Q5. The large scale transmission of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up because of

(a) reduction of current
(b) reduction of current and voltage both
(c) power loss is cut down
(d) (a) and (c) both

Q6. A free floating magnetic needle at North pole is __________to the surface of earth.

Q7. The final image formed in an astronomical refracting telescope with respect to the object is:

(a) Real inverted
(b) Real erect
(c) Virtual erect
(d) Virtual inverted

Q8. If the magnetizing field on a ferromagnetic material is increased, its permeability:

(i) decreases
(ii) increases
(iii) remains unchanged
(iv) first decreases and then increases

Q9. An electron is moving along positive x-axis in a magnetic field which is parallel to the positive y-axis. In what direction will the magnetic force be acting on the electron?

(a) Along -x axis
(b) Along -z axis
(c ) Along +z axis
(d) Along -y axis

Q10. If the ammeter in the given circuit shown in the diagram reads 2A, the resistance R is:

(a) 1?
(b) 2?
(c) 3?
(d) 4?

ANSWERS

Ans 1.
(b) Conductor

Ans 2.
(d) Higher the frequency, greater is the stopping potential

Ans 3.
(iv) zero

Ans 4.
Difference in initial mass energy and energy associated with mass of products
Or
Total Kinetic energy gained in the process

Ans 5.
(d) Both reduction of current, and power loss is cut down

Ans 6.
45 degree or vertical

Ans 7.
(d) virtual and inverted

Ans 8.
(i) decreases

Ans 9.
(b) Along -z axis

Ans 10.
(a) 1?.

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