Q 1: A moving charge will produce



|[pic]Q 1: A moving charge will produce |

|a) |

|no field |

|b) |

|an electric field |

| |

| |

|c) |

|a magnetic field |

|d) |

|both 'b' and 'c' |

| |

|Q 2: A man in air, a fish in water appears to be at 30 cm from the surface. If |

|refractive index of water is 4/3, then the true depth at which the fish remain |

|is : |

|a) |

|30 cm |

|b) |

|40 cm |

| |

| |

|c) |

|50 cm |

|d) |

|35 cm |

| |

|Q 3: If refractive index of calcite crystal is [pic]for O-ray and [pic]for |

|E-ray, then along the optical axes of the crystal. |

|a) |

|[pic] |

|b) |

|[pic] |

| |

| |

|c) |

|[pic] |

|d) |

|none of these |

| |

|Q 4: In Young's double slit experiment, the separation between the slits is |

|halved and the distance between the slits and screen is doubled. The fringe |

|width is |

|a) |

|unchanged |

|b) |

|doubled |

| |

| |

|c) |

|halved |

|d) |

|quadrupled |

| |

|Q 5: Electric lines of force about positive charge are |

|a) |

|circular, clockwise |

|b) |

|circular, anticlockwise |

| |

| |

|c) |

|radial inward |

|d) |

|radial outward |

| |

|Q 6: A parallel plate air capacitor has a capacitance [pic]. If the distance |

|between the plates is trebled and a dielectric medium is introduced the |

|capacitance becomes [pic]. The dielectric constant of the medium is |

|a) |

|4 |

|b) |

|12 |

| |

| |

|c) |

|9 |

|d) |

|2 |

| |

|Q 7: Find the resistance of a circuit between A and B in the figure below  |

|[pic] |

|a) |

|3 R |

|b) |

|3 R/2 |

| |

| |

|c) |

|R/3 |

|d) |

|2 R/3 |

| |

|Q 8: If there are n capacitors in parallel connected to V volt source, then |

|energy stored is equal to |

|a) |

|CV |

|b) |

|[pic] |

| |

| |

|c) |

|CV2 |

|d) |

|[pic] |

| |

|Q 9: If the number of condensers are connected in series, then their resultant |

|capacitance is |

|a) |

|lower than the lowest individual capacity |

| |

| |

|b) |

|higher than the highest individual capacity |

| |

| |

|c) |

|equal to the sum of the individual capacity |

| |

| |

|d) |

|cannot be predicted |

| |

|Q 10: If two condensers of capacity C1 and C2 are connected in parallel, their |

|equivalent capacity Cp is |

|a) |

|C1 + C2 |

|b) |

|[pic] |

| |

| |

|c) |

|[pic] |

| |

| |

|d) |

|[pic] |

| |

|Q 11: Sixty four charged drops of capacity C and potential V are put together |

|to form a bigger drop. If charge on each drop is q, then the charge on bigger |

|drop will be |

|a) |

|16 q |

|b) |

|4 q |

| |

| |

|c) |

|64 q |

|d) |

|q |

| |

|Q 12: Electric intensity at a distance r from the centre of a conducting sphere|

|having a charge q is |

|a) |

|[pic] |

|b) |

|[pic] |

| |

| |

|c) |

|[pic] |

|d) |

|[pic] |

| |

|Q 13: In the following circuit, minimum current will flow through the |

|resistance of |

|[pic] |

|a) |

|[pic] |

|b) |

|[pic] |

| |

| |

|c) |

|[pic] |

|d) |

|[pic] |

| |

|Q 14: Which one of the following radiation has the lowest frequency ? |

|a) |

|visible light |

|b) |

|X-rays |

| |

| |

|c) |

|microwaves |

|d) |

|Ultraviolet rays |

| |

|Q 15: Two smaller voltmeter of same ranges are connected in series and this |

|series combination is connected across 1 ohm resistor with a battery of emf of |

|1 volt. The readings in the two voltmeters respectively will be |

|a) |

|1 volt and zero |

|b) |

|(1/2) volt each |

| |

| |

|c) |

|zero volt and zero volt |

| |

| |

|d) |

|the combination will not work |

| |

|Q 16: Which one of the following is not an application of eddy currents ? |

|a) |

|speedometer of automobiles |

| |

| |

|b) |

|damping of oscillations of a simple pendulum |

| |

| |

|c) |

|damping of a galvanometer |

|d) |

|induction furnace |

| |

|Q 17: A and B are section of two long parallel wires placed perpendicular to |

|the plane of paper. They carry currents of 5 ampere and 10 ampere respectively |

|in the directions indicated in the directions indicated in the figure. If the |

|separation between them is 3 m, the zero of the magnetic field in the plane of |

|the paper is at a point |

|[pic] |

|a) |

|3 m to the left A |

|b) |

|3 m to the right of B |

| |

| |

|c) |

|2 m to the right of A |

|d) |

|2 m to the left of B |

| |

|Q 18: Which one of the following substance is diamagnetic ? |

|a) |

|liquid oxygen |

|b) |

|air |

| |

| |

|c) |

|copper sulphate |

|d) |

|water |

| |

|Q 19: In a series L-C-R circuit, the value of L and C are so adjusted that the |

|maximum current flows through the circuit. In the case, if the P.D. across L is|

|200V, then the P.D. across the capacitance will be |

|a) |

|more than 200V |

|b) |

|less than 200V |

| |

| |

|c) |

|equal to 200V |

| |

| |

|d) |

|P.D. across the resistance |

| |

|Q 20: Einstein photoelectric equation states that [pic]In this equation v |

|refers to |

|a) |

|velocity of all ejected electrons |

| |

| |

|b) |

|mean velocity of emitted electrons |

| |

| |

|c) |

|minimum velocity of emitted electrons |

| |

| |

|d) |

|maximum velocity of emitted electrons |

| |

|Q 21: The de Broglie wavelength associated with a ball of mass 200 g and moving|

|at a speed of 5 meters/hour, is of the order of [pic] |

|a) |

|[pic] |

|b) |

|[pic] |

| |

| |

|c) |

|[pic] |

|d) |

|[pic] |

| |

|Q 22: In case of an n-p-n transistor, the collector current is always less than|

|the emitter current, because |

|a) |

|emitter side is forward biased |

| |

| |

|b) |

|collector side is reverse biased |

| |

| |

|c) |

|a few electrons are lost in the base |

| |

| |

|d) |

|a few electrons are lost in the emitter |

| |

|Q 23: Which of the following is NOT disadvantage of transistor over a triode? |

|a) |

|low efficiency |

| |

| |

|b) |

|higher temperature sensitivity |

| |

| |

|c) |

|higher noise level |

| |

| |

|d) |

|can handle only smaller currents |

| |

|Q 24: The velocity of electromagnetic waves in a medium is [pic]The electric |

|constant of the medium is |

|a) |

|4 |

|b) |

|2.25 |

| |

| |

|c) |

|3/2 |

|d) |

|2/3 |

| |

|Q 25: The belt of an electrostatic generator is 50 cm wide and travels 30 cm / |

|sec. The belt carries charge into the sphere at a rate corresponding to |

|[pic]ampere. What is the surface density of charge on the belt. |

|a) |

|[pic] |

|b) |

|[pic] |

| |

| |

|c) |

|[pic] |

|d) |

|[pic] |

| |

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