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Choose the correct answer :

An ideal heat engine operates between two temperature 600 K and 800 K. What is the
efficiency of the engine?

(8) 50% (0) 10%
(9 38% (6) 100%

Moment of inertia of a triangular section of base (b) and height (h) about an axis passing
through its C.G. and parallel to the base, 15

(8) 014 (b) 0888
)© 818/12 (५) 86

The phatoelectric effect was explained by Albert Einstein by assuming that:

(घ) Lightisa wav (b) Light is a particle
(€) Anelectron behaves as a wave (ಡೆ) An electron behaves as a particle

Which of the following formulas can be used to determine the de Broglie wavelength?

(ध) = का ಗ) 4 = 7/४
(८) 4 = ‏+۰٥‎ (वी A=mulh

The Lyman series of hydrogen spectrum lies in the region

(घ) Infrared (0) Ultraviolet
(८) Visible (५) Of X rays

Two plane mirrors are at 43° to each other. If an object is placed between them, then the
number of images will be

(8) 5 0) 7
© 9 (५ 8

A body moves a distance of 10 m along a ‏و‎ ht line under the action of a force of 5 N. If the
work done is 25 joules, the angle which the force makes with the direction of motion of the
body is

வ ° ⋅ (b) 605
(0 30९ ⋅ (ദ) 90°

When a spring is stretched by 2 em, it stores 100 J of energy. If it is stretched further by
2 em, the stored energy will be increased by

) 1007 (0): 800/1
(9 2007 (ல்‌ 40047

2 75/2015