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A glass prism with a refracting angle of ${60}^{\circ }$ has a refractive index $1.52$ for red light. A parallel beam of white light is incident on one face of the prism at an angle of incidence, which gives minimum deviation for red light. Find the angle of minimum deviation for red light.

[Given: $\sin \left({50}^{\circ }\right)=0.760$]

The unit of electrical power is ___.

Four different colours of light red, yellow, blue, and violet are incident on a prism at the same angle. The order of the angles of emergence will be:

A cut diamond sparkles because of its ___ .

Interference effects are produced at point $P$ on a screen as a result of direct rays from a $500\text{nm}$ source and reflected rays from a mirror, as shown in the figure. If the source is $100\text{m}$ to the left of the screen and $1.00\text{cm}$ above the mirror, find the distance $y$ to the first dark band above the mirror.

Give reasons for:

a) Charcoal is a better fuel in comparison to wood.

b) Bio- gas is considered an ideal fuel.

c) What does OTEC stand for.

To what height should an object of mass $\text{2 kg}$ be raised so that its potential energy is $\text{980 J}$?

1.A copper wire has diameter 0.5mm & reactivity of 1.6*10 to the power -8 ohm m.what will be the length of this wire to make its resistance 10 ohm ? How much does the resistance charge if the diameter is doubled?

Why is the loss of heat due to radiation minimised in a calorimeter?

Question 9
Magnification produced by a rear view mirror fitted in vehicles

(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it .

A bulb is rated 5 V and 500 mA. Calculate its (a) power, (b) resistance, and (c) energy consumed when it is lighted for 4 hours.

A pendulum clock having copper rod keeps correct time at ${20}^{\circ }$C. It gains 15 seconds per day if cooled to $0^{\circ }$C. Calculate the coefficient of linear expansion of copper.

A bullet of mass 20 g moving with a velocity of 100 m/s strikes a wooden block of mass 80 g and gets embedded into it. Calculate the velocity of the combined system.

A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10⁻⁸ Ω m. What will be the length of this wire to make its resistance 10 Ω? How much does the resistance change if the diameter is doubled?

Question 12

If the current I through a resistor is increased by $100\%$ (assume that temperature remains unchanged), the increase in power dissipated will be



(a) $100\%$

(b) $200\%$

(c) $300\%$

(d) $400\%$

1. A real image is cast by a lens. What can be said about the magnification produced by the lens?
2. A concave mirror forms an upright image of an object placed at 20 cm from it. The size of the image is two times that of the object. Find the position of the image. [3 MARKS]

In a transformer there are $10000$ turns in primary coil and $25000$ turns in secondary coil. An $\text{AC}$ source of emf $E=50\sin \pi t$ $\text{V}$ is applied across primary coil, find the peak emf across secondary coil in ideal conditions.

What is petroleum?

The name of equation showing relation between electrode potential (E)

standard electrode potential and concentration of ions in solution is

If a lens has a focal length, F = +12 cm, then it is a

There is a bar in my hand. When I suspend it using a thread, it aligns itself such that one end faces the geographic east direction. It also attracts plastic items. What can this bar be considered analogically similar to?

A point object O is placed in front of a transparent slab at a distance x from its closer surface. It is seen from the other side fo the slab by light incident nearly normally to the slab. The thickness of the slab is t and its refractive index is $\mu .$ Show that the apparent shift in the position fo the object is independent of x and find its value.

In a parallel circuit:

What form of energy is possessed by waves?

If the refractive indices of a flint glass for red, yellow and violet colours are $1.42,1.44\text{and}1.48$ respectively then, the dispersive power of the glass is :