Physics Sample Question Paper for Term 1 (CBSE Board exam for 2021-22) – paper code 042

This is a sample question paper of Physics for class 12 CBSE Board examination, Term 1 (year 2021 – 22, paper code 042). This is equally good for ISC students.

Sample Question Paper for Physics Term 1, CBSE Board exam 2021-22 (paper code 042) & for ISC

SECTION A
This section consists of 25 multiple choice questions with the overall choice to attempt any 20 questions. In case more than the desirable number of questions are attempted, ONLY the first 20 will be considered for evaluation.

Q1.Which of the following is NOT the property of equipotential surface?

(i) They do not cross each other.
(ii) The rate of change of potential with distance on them is zero.
(iii) For a uniform electric field they are concentric spheres.
(iv) They can be imaginary spheres.

Q2. Two point charges +8q and -2q are located at x=0 and x=L respectively. The point on x axis at which net electric field is zero due to these charges is-
(i) 8L
(ii) 4L
(iii) 2 L
(iv) L

Q3. An electric dipole of moment p is placed parallel to the uniform electric field. The amount of work done in rotating the dipole by 900 is-
(i) 2pE
(ii) pE
(iii) pE/2
(iv) Zero

Q4. Three capacitors 2μF, 3μF and 6μF are joined in series with each other.
The equivalent capacitance is-
(i) 1/2μF
(ii) 1μF
(iii) 2μF
(iv) 11μF

Q5. Two point charges placed in a medium of dielectric constant 5 are at a distance r between them, experience an electrostatic force ‘F’. The electrostatic force between them in vacuum at the same distance r will be-
(i) 5F
(ii) F
(iii) F/2
(iv) F/5

Q6. Which statement is true for Gauss law-
(i) All the charges whether inside or outside the Gaussian surface contribute to the electric flux.
(ii) Electric flux depends upon the geometry of the gaussian surface.
(iii) Gauss theorem can be applied to the non-uniform electric field.
(iv) The electric field over the gaussian surface remains continuous and uniform at every point.

Q7.Capacitor plates are charged by a battery with ‘V’ volts. After charging the battery is disconnected and a dielectric slab with dielectric constant ‘K’ is inserted between its plates, the potential across the plates of a capacitor will become
(i) Zero
(ii) V/2
(iii) V/K
(iv) KV

Q8.The best instrument for accurate measurement of EMF of a cell is-
(i) Potentiometer
(ii) metre bridge
(iii) Voltmeter
(iv) ammeter and voltmeter

Q9.An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 3:2 and 2:3, then the ratio of the current passing through the wire will be
(i) 2:3
(ii) 3:2
(iii) 8:27
(iv) 27:8

Q10.By increasing the temperature, the specific resistance of a conductor and a semiconductor-
(i) increases for both.
(ii) decreases for both.
(iii) increases for a conductor and decreases for a semiconductor.
(iv) decreases for a conductor and increases for a semiconductor.

Q11.We use alloys for making standard resistors because they have
(i) low temperature coefficient of resistivity and high specific resistance
(ii) high temperature coefficient of resistivity and low specific resistance
(iii) low temperature coefficient of resistivity and low specific resistance
(iv) high temperature coefficient of resistivity and high specific resistance

Q12. A constant voltage is applied between the two ends of a uniform metallic wire, heat ‘H’ is developed in it. If another wire of the same material, double the radius and twice the length as compared to original wire is used then the heat developed in it will be-
(i) H/2
(ii) H
(iii) 2H
(iv) 4H