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qUESTIONS

MCQs-PYQs-12th-jee

Two identical glass (ng = 3/2) equiconvex lenses of focal length f each are kept in contact. The space between that two lenses filled with water (n = 4/3). The focal length of the combination

MCQs-PYQs-12th-jee

An object is located 4m from the first of two thin converging lenses of focal lengths 2m and 1m respectively. The lenses are separated by 3m. The final image formed by the second lens is located from the source at a distance of

MCQs-PYQs-12th-jee

A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is

MCQs-PYQs-12th-jee

Two identical bar magnets are placed one above the other such that they are mutually perpendicular and bisect each other. The time period of this combination in a horizontal magnetic field is T. The time period of each magnet in the same field is

MCQs-PYQs-12th-jee

A concave mirror of focal length ‘fi’ is placed at a distance of ‘d’ from a convex lens of focal length ‘f2’. A beam of light coming from infinity and falling on this convex lens – concave mirror combination returns to infinity. The distance ‘d’ must equal

MCQs-PYQs-12th-jee

In a plano-convex lens the radius of curvature of the convex lens is 10 cm. If the plane side is polished, then the focal length will be (Refractive index = 1.5)

MCQs-PYQs-12th-jee

Two magnets of same size and mass make respectively 10 and 15 oscillations per minute at certain place. The ratio of their magnetic moments is

MCQs-PYQs-12th-jee

The time period of a vibration magnetometer is To. Its magnet is replaced by another magnet whose moment of inertia is 3 times and magnetic moment is 1/3 of the initial magnet. The time period now will be

MCQs-PYQs-12th-jee

A bar magnet is oscillating in the earth’s magnetic field with time period T. If its mass is increased four times then its time period will be

MCQs-PYQs-12th-jee

An equiconvex lens is cut into two halves along (i) XOX’ and (ii) YOY’ as shown in the figure. Let f, f’, f” be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively

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