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(a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends.

(b) What is the unit of power of a lens? Define the unit of power of a lens.

(c) A combination of lenses for a camera contains two converging lenses of focal lengths 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.

A substance on heating, undergoes (i) a rise in its temperature, (ii) a change in its phase without change in its temperature. In each case, state the change in energy of molecules of the substance.

In which of the following cases a light ray suffers the maximum deviation while passing through pole?

AB is object, A'B' is image formed. Choose the most appropriate opption.

The ratio of the refractive index of red light to blue light in air is

Which among the following is a function of the vitreous humour?

A pair of scissors has its blades 15 cm long, while its handles are 7.5 cm long. What is its mechanical advantage ?

A $1-\varphi$ , 3 kVA, 240/120 V, 60 Hz transformer has the following parameters:

$R_{HV}=0.25\Omega$ $R_{LV}=0.05\Omega$

$X_{HV}=0.75\Omega$ $X_{LV}=0.18\Omega$

If the transformer is supplying full load on LV side at 110 V and 0.9 leading power factor then the voltage regulation is

Way of harness of solar energy

After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below
$\begin{array}{cccc}S.NO& \angle i& \angle i& \angle e\\ I& {30}^{\circ }& {20}^{\circ }& {31}^{\circ }\\ II& {40}^{\circ }& {25}^{\circ }& {40}^{\circ }\\ III& {50}^{\circ }& {31}^{\circ }& {49}^{\circ }\end{array}$
The correct observations are

A piece of iron of mass 2.0 kg has a thermal capacity of 966 JK${}^{-1}$ . Find the heat energy needed to warm it by ${15}^{0}C$.

Define the term specific resistance and state its S.I. unit.

''When parallel sunrays are incident on concave mirror it converges...meet at focus and hence the solar cooker works'', but sun rays are not parallel at all so how can we say this??

A concave mirror of radius of curvature 10 cm is cut into two equal parts, slightly separated and placed in front of a monochromatic line source S of wavelength 2000 $\hat{A}$ as shown in figure. Consider only interference in reflected light after first reflection from mirrors. Assume direct light from S is blocked from reaching the screen

If half of reflecting surface of upper part of mirror is painted black then choose correct option

V=IR then,R=V/I.if we change the value of I and V is there any affect on R

Average free flow speed and the jam density observed on a road stretch are 60 km/h and 120 vehicles/ km, respectively. For a linear speed density relationship, the maximum flow on the road stretch (in vehicles/h) is

1. 1800

The resistance of an ammeter is $13\Omega$ and its scale is made for a current upto 100 amp. After an additional shunt has been connected to this ammeter it becomes possible to measure current upto 750 amp.. The value of shunt resisance is

The figure shows a smoothly curved track terminating in a smooth horizontal part. A spring of spring constant 400 N/m is attached at one end to a wedge fixed rigidly with the horizontal part. A 40 g mass is released from rest at a height of 4.9 m on the curved track. Find the maximum compression of the spring. (g = 9.8 m/$s^2$)

The figure shows a network of resistors and a battery. If $1\text{A}$ current flows through the branch $CF$ then





The emf $E$ of the battery is

One plano-convex and one plano-concave lens of same radius of curvature $R$ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of $1$ is ${\mu }_1$ and that of $2$ is ${\mu }_2$ , then the focal length of the combination is

The correct relation between heat produced (H) and electric current (I) is?

Find out the appropriate word which fits the 6th blank.

A
woman bends over me,

Searching
my reaches for what she really is.

Then
she turns to those liars, the candles or the moon.

Why
have the candles and the moon been called 'liars'?

i.
because they make people beautiful

ii.
they hide the blemishes of people with their soft light

iii.
they hide the blemishes and make people look beautiful in their soft
glow

iv.
they can't talk

Due to some accident, if the eyeball elongates. Then that person is said to be affected by