Nsep

The best material for strips marked S and S¹ is

(a) Plastic (b) Aluminium (c) Cast Iron (d) Plated Brass

A ball is dropped onto a horizontal surface from a height of 36 cm. After bouncing several times it comes to rest covering a total distance of 100 cm measured in a vertical direction. The percentage loss in its kinetic energy after its first impact is

(a) 36 (b) 64 (c) 53 (d) 96 

It is required to decide the ratio (e₁ / e₂) by sum and difference method also. Four cells with different values of emf E are available. One must use a cell of emf E equal to 

(a) 1.40 V  (b) 2.0 V  (c) 4.5 V  (d) 1.08 V 

Two identical thin metal strips, one of aluminum and the other of iron are riveted together to form a bimetallic strip. The temperature is raised by 50°C. If the central planes of the two strips are separated by 2 mm and the coefficients of thermal expansion for aluminum and iron are respectively 30 x 10^-6 / °C and 10 x 10^-6 / °C, the average radius of curvature of the bimetallic strip is about 

(a) 50 cm (b) 100 cm (c) 150 cm (d) 200 cm 

It is claimed that the strips S and S¹ serve two purposes I. to decide the end points of the wire and II. To keep the wires in place, then 

(a)  both I and II are important 

(b)  I is more important than II 

(c)  II is more important than I 

(d)  both are equally important

A thin annular metal disc of inner and outer radii R₁ and R₂  respectively, is freely suspended from a point on its outer circumference. The length of the corresponding equivalent simple pendulum is

A convex lens and concave lens are kept in contact and the combination is used for the formation of image of a body by keeping it at different places on the principal axis. The image formed by this combination of lenses can be : 

(A) Magnified, inverted and real

(B)  Diminished, inverted and real

(C) Diminished, erect and virtual

(D) Magnified, erect and virtual 

A particle moves in a plane with a constant speed along a path y = 2x² + 3x – 4. When the particle is at (0, – 4) the direction along which it is moving is inclined to the X axis at an angle 

(a) 63⁰ (b) 72⁰ (c) 27⁰ (d) 0⁰

Which of the following will give a straight line graph? 

(a) log A against t (b) log A against1/t (c) A against t² (d) A² against t

Refer to the circuit given below. Output voltage V₀ is measured between points a and b. Then,

(a)  the peak value of V₀ is 2.5 V above the minimum if the diode is assumed to be ideal 

(b)  the positive half cycle of the input is clipped 

(c)  the circuit acts as a rectifier 

(d)  the peak value V₀ is about 3.2 V above the minimum if D is silicon diode (non-ideal)