PHYSICS – XII

OBJECTIVE

MULTIPLE CHOICE

Direction :- Choose the correct alternative from the following :

Q.1.     When air is replaced by a dielectric medium of dielectric constant K, the

maximum force of attraction between two charges separated by a distance :

(a) decreases K times                          (b) remains constant

(c) increases K times                           (d) decreases K² times

Q.2.     A given charge situated at a certain distance from an electric dipole of very small

length along its axial line experience a force F. If the distance of the charge is

doubled, the force on charge will become :

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MATHEMATICS -X

OBJECTIVE TYPE QUESTION

MULTIPLE CHOICE

Q.1.     The value of ‘k’ for which the system of linear equation :

kx + 3y = 2k + 1 and 2(k + 1)x + 9y = 7k + 1

have infinite solution is :

(a) 2                             (b) 1                             (c) 3                             (d) –2

Q.2.     The G.C.D. of :

4(x⁴ – 1 ) and (x³ – x² –x + 1)

is :

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PHYSICS

OBJECTIVE  TYPE QUESTION

MULTIPLE CHOICE

Direction :- Choose the correct alternative from the following :

Q.1.     Three charges +4q , Q and q are placed in a straight line of length l at points at

distances 0, l/2 and l respectively. The value of Q in order to make the net force

on q to be zero is given by :

(a)    – q                         (b) – 2q                        (c) – q/2                       (d) 4q

Q.2.     A point Q lies on the perpendicular bisector of an electric dipole of dipole

moment p. If the distance of Q from the Dipole is r (much larger than the size of

the dipole), then the electric field at Q is proportional to :

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MATHEMATICS-X

OBJECTIVE TYPE QUESTION

MULTIPLE CHOICE

Q.1.     The only value of ‘k’ for which the system of linear equations :

x + (k + 1)y = 5 and (k + 1)x + 9 = 8k – 1

has infinite solutions is :

(a) – 4                          (b) 2                             (c) – 2                          (d) 4

Q.2.     The H.C.F. of x⁴ – 1 and x³ + x² + x + 1 is :

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MATHEMATICS – X

OBJECTIVE  TYPE  QUESTION

MULTIPLE CHOICE

Q.1.     The value of ‘k’ when the system of linear equations

2x + 3y = 2 and (k + 2)x + (2k + 1)y = 2(k – 1)

have an infinite number of solution is :

(a) 1                             (b) 2                             (c) 4                             (d) 8

Q.2.     The following rational expression

(x⁴ – 10x + 9)/(x³ + 4x² + 3x)

when reduced into lowest form is :

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PHYSICS

OBJECTIVE  TYPE  QUESTION

MULTIPLE CHOICE

Direction :- Choose the appropriate alternative from the following :

Q.1.     Force between two stationary charges , when placed in free space is 10 N. If they

are placed in a medium of relative permittivity 5, the force between them is :

(a) 50N                        (b) 2 N                         (c) 0.5 N                      (d) 10 N

Q.2.     The number of electrons to be put on a spherical conductor of radius 0.1 m to

produce electric field of 0.36 NC^-1 just above the surface is :

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MATHEMATICS-X

OBJECTIVE TYPE QUESTION

MULTIPLE CHOICE

Q. 1.    The value of ‘k’ for which the system of linear equations, 3x + y = 1

and (2k – 1)x + (k – 1)y = 2k +1, have no solution is :

(a) 1/2                          (b) 1                             (c) 2                             (d) – 2

Q.2      The rational expression (x + 5)(x² + 7x + 10)/(x – 3)(x² + 10x + 25), when

reduced into lowest form is :

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PHYSICS

OBJECTIVE TYPE QUESTION

MULTIPLE CHOICE

Direction :- Choose the correct alternative from the following :

Q.1.     A polythene piece rubbed with wool is found to have a negative charge of

1.6×10^-6 C. (The charge on electron is 1.6×10^-19 C). Then, the number of electrons

transferred is :

(a) 10¹³ from wool to polythene                      (b) 10¹³ from polythene to wool

(c) 2.56 × 10¹⁵ from wool to polythene          (d) 10^-13 from wool to polythene

Q.2.     Three charges each of +q are placed at the three vertices of an equilateral triangle.

If the distance of centroid from each vertex of the triangle is r, then strength of

electric field at the centroid will be :

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MATHEMATICS – (CBSE – X)

OBJECTIVE     TYPE

MULTIPLE CHOICE

Q. 1.    The value of ‘k’ for which the system of equation:

2x + 3y = 4  and  (k + 2)x + 6y = 3k + 2

have infinite solution is :

(a) 1                 (b) –1                           (c) 2                             (d) –2

Q. 2.    The G.C.D. of :           x² – x – 6 and x³ – 27 is :

(a) x + 2           (b) x² + 3x + 9             (c) x + 3                       (d) x – 3

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PHYSICS for COMPETITION

OBJECTIVE TYPE QUESTION

MULTIPLE CHOICE

Direction – Choose the correct alternative from the following :-

Q.1.     Static electricity is produced due to :

(a) friction       (b) conduction             (c) induction                (d) both a and c

Q.2.     A cube of side b has a charge q at each of its vertices. The electric field due to this

charge distribution at the centre of the cube will be :

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