Practice Test for 10+2 Board Examination- Physics

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Maharishi Markandeshwar (Deemed to be University) Mullana-Ambala, Haryana

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When a glass rod is rubbed with silk, it

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(a) gains electrons from silk.

(b) gives electrons to silk.

(d) gives protons to silk

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In general, metallic ropes are suspended on the carriers taking inflammable materials. The reason

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(a) to control the speed of the carrier.

(b) to keep the centre of gravity of the carrier nearer to the earth.

(d) All the above

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Two charges q1 and q2 are placed in vacuum at a distance d and the force acting between them is F. If a medium of dielectric constant 4 is introduced around them, the force will become

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(a) 4F

(b) F/4

(d) F

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Two similar spheres having +Q and -Q charges are kept at a certain distance. F force acts between the two. If at the middle of two spheres, another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as

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(a) zero having no direction.

(b) 8F towards +Q charge.

(d) 4F towards +Q charge.

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Two small spheres each carrying a charge q are placed r metre apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to

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(a) force between them × r

(b) force between them × 2πr

(d) zero

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A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is

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(a) 0 V

(b) Same as at point 5 cm away from the surface

(d) Same as at point 25 cm away from the surface

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Angle of dip is 90° at

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(a) poles.

(b) equator.

(d) ¼

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The electric field inside a spherical shell of uniform surface charge density is

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(a) zero.

(b) constant, less than zero.

(d) none of the these

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A parallel plate condenser is connected with the terminals of a battery. The distance between the plates is 6mm. If a glass plate (dielectric constant K = 9) of 4.5 mm is introduced between them, then the capacity will become

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(a) 2 times.

(b) the same.

(d) 4 times.

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A capacitor is charged by using a battery which is then disconnected. A dielectric slab then slipped between the plates, which results in across the plates.

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(a) reduction of charge on the plates and increase of potential difference

(b) increase in the potential difference across the plate, reduction in stored energy, but no change in the charge on the plates.

(c) decrease in the potential difference across the plates, reduction in the stored energy, but no change in the charge on the plates

(d) none of these

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In a parallel plate capacitor, the capacity increases if .

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(a) area of the plate is decreased.

(b) distance between the plates increases

(d) dielectric constantly decreases.

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Drift velocity vd varies with the intensity of electric field as per the relation

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(a) vd ∝ E

(b) vd ∝ 1/E

(d) vd ∝ E²

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For measurement of potential difference, a potentiometer is preferred over voltmeter because . voltmeter.

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(a) potentiometer is more sensitive than voltmeter.

(b) the resistance of potentiometer is less than

(d) potentiometer does not take current from the circuit.

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If n cells each of emf E and internal resistance r are connected in parallel, then the total emf and internal resistance will be

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(a) E, r/n

(b) E, nr

(d) nE, nr

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When a metal conductor connected to left gap of a meter bridge is heated, the balancing point

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(a) shifts towards right

(b) shifts towards left

(d) remains at zero

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A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 weber/m². The magnetic dipole moment of the coil is

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(a) 0.15 ampere-m²

(b) 0.3 ampere-m²

(d) 0.6 ampere-m²

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The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into voltmeter that can read upto 50 V. The resistance to be connected in the series with the galvanometer is

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(a) 2010 Ω

(b) 4050 Ω

(d) 4960 Ω

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If the beams of electrons and protons move parallel to each other in the same direction, then they

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(a) attract each other.

(b) repel each other.

(d) neither attract nor repel.

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When a magnetic compass needle is carried nearby to a straight wire carrying current, then(I) the straight wire cause a noticeable deflection in the compass needle.(II) the alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire

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(a) (I) is correct

(b) (II) is correct

(d) neither (I) nor (II) is correct

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A strong magnetic field is applied on a stationary electron. Then the electron

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(a) moves in the direction of the field.

(b) remained stationary.

(d) moves opposite to the direction of the field.

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A charged particle is moving on circular path with velocity v in a uniform magnetic field B, if the velocity of the charged particle is doubled and strength of magnetic field is halved, then radius becomes

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(a) 8 times

(b) 4 times

(d) 16 times

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Two α-particles have the ratio of their velocities as 3 : 2 on entering the field. If they move in different circular paths, then the ratio of the radii of their paths is

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(a) 2 : 3

(b) 3 : 2

(d) 4 : 9

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A moving coil galvanometer can be converted into an ammeter by

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(a) introducing a shunt resistance of large value in series.

(b) introducing a shunt resistance of small value in parallel.

(d) introducing a resistance of large value in parallel.

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Angle of dip is 90° at

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(a) poles.

(b) equator.

(d) tropic of cancer.

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At a certain place on earth, BH = (1/√3) BV angle of dip at this place is

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(a) 60°

(b) 30°

(d) 90°

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When a metal conductor connected to left gap of a meter bridge is heated, the balancing point

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(a) shifts towards right

(b) shifts towards left

(d) remains at zero

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The angle of dip at a certain place where the horizontal and vertical components of the earth’s magnetic field are equal is

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(a) 30°

(b) 75°

(d) 45°

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Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon

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(a) the rate at which currents are changing in the two coils.

(b) relative position and orientation of two coils.

(d) the currents in the two coils.

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A coil having 500 sq. loops of side 10 cm is placed normal to magnetic flux which increases at a rate of 1 T/s. The induced emf is

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(a) 0.1 V

(b) 0.5 V

(d) 5 V

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Lenz’s law of electromagnetic induction is as per law of conservation of

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(a) energy.

(b) momentum angular.

(d) electromotive force.

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The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was

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(a) moving towards the solenoid

(b) moving into the solenoid

(d) moving out of the solenoid

Clear selection

Disclaimer: The set of questions aimed for the preparation of students appearing in 10+2 board exams. Questions have been compiled using open access online sources.

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