A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle (a) 2θ (b) 0° (c) θ (d) 4θ

A light beam is being reflected by using two mirrors, as in a per…

The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is

(a) 27 : 5

(b) 5 : 27

(c) 4 : 1

(d) 1 : 4

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L, C and R represent physical quantities-inductance, capacitance and resistance respectively. The one which has same dimensions as time is:

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A conducting square loop of side l and resistance R moves in its plane with a uniform velocity u perpendicular to one of its sides. A uniform and constant magnetic field B exists along the perpendicular to the plane of the loop as shown in figure. The current induced in the loop is:

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The diagram given show the variation of voltage and current in an AC circuit. The circuit contains.

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Capacitance of a capacitor made by a thin metal foil is 2μF. If the foil is folded with paper of thickness 0.15 mm, dielectric constant of paper is 2.5 and width of paper is 400 mm , then length of foil will be

(a) 0.34 m

(b) 1.33 m

(c) 13.4 m

(d) 33.9 m

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The wavelength of light emitted from second orbit to first orbits in a hydrogen atom is

(a) 1.215