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An image 3/2 of size of object is formed by a convex lens at a distance of 12cm from it. Find focal length

What are the two ways of harnessing nuclear energy?

How can you say current has a magnetising nature?

The diagram in below figure shows the experimental set up for the determination of focal length of a lens using a plane mirror.

(i) Draw two rays from the point O of the object to show the formation of image I at O itself.

(ii) What is the size of the image I ?

(iii) State two more characteristics of the image I.

(iv) Name the distance of the object O from the optical centre of the lense.

(v) To what point will the rays return if the mirror is moved away from the lens by a distance equal to the focal length of the lens?

A piece of wire of resistance $R$ is cut into five parts of equal length. These parts are then connected in parallel. If the equivalent resistance of the parallel combination is $R^{{}^{\prime }}$, then the ratio $\frac{R}{R^{{}^{\prime }}}$ is:

an object of size 5cm is placed at 30cm infront of a concave mirror of focal length 20cm .At what distance should a screen be placed so that a sharp image formed on it? determine the nature and size.

Suffocation due to lack of oxygen supply is called

Q1) An electric iron consumes energy at a rate of 840W ehen heating is in at maximum and 360W when heating is at minimum. The voltage is 220V. What are current and resistance in each case?

Q2) Which uses more energy, a250W set in 1hour OR a 1200W toaster in 10 minutes?

Q3) What is the role of split rings in DC motor?

Q4) Write the principal of generator?

Q5) Write the function of brush in generator?

The equivalent resistance of a circuit that has two equal resistors in series is $8\Omega$. Find the value of each resistor.

What should be the rating of an electric fuse for a Micro oven, which is operating on a current rating of 5A?

Briefly describe how you would find the focal length of a concave mirror quickly but approximately.

The 7th International Ground Water Conference was hosted by

Between which two points of concave mirror should an object be placed to obtain a magnification of (a) - 3 (b) + 2.5 (c) - 0.4

What is meant by saying that the electric potential at a points is 1 volt?

A 5g piece of ice at $-{20}^{\circ }$C is put into 10g of water at ${30}^{\circ }$C. Assuming that heat is enchanged only between the ice and the water, find the final temperature of the mixture. Specific heat capacity of ice $=2100Jk{g}^{-1}{}^{\circ }{C}^{-1}$. Specific heat capacity of water $=4200Jk{g}^{-1}{}^{\circ }{C}^{-1}$ and latent heat of fusion of ice $3.36\times {10}^{5}Jk{g}^{-1}$.

If two equal and opposite forces have the same line of action, then

A current of 5 A flows through a circuit for 15 minutes. The amount of electric charge that flows through the circuit during this time equals __ C.

Which of the following boxes contains isotones? (Numbers in the box represents mass number)

Find the resistance of an electric motor which when connected across a battery of $6$ volts for 1 min consumes $216$ Joules of energy?

Considering the relation between current $I$, voltage $V$ and resistance $R$, which of the following equations is/are TRUE?

What type of current we get at our homes ac or dc .

Name the physical quantity whose unit is dioptre.

What is it called when a current skips a part of the circuit?

A point light source is placed in front of a convex mirror at a distance of 40 cm. The focal length of the mirror is 40 cm. Find the position of the image.

Identify the correct reordered form of the jumbled list of phrases.

for serving / the fast food joint / sticking out of the bun / with an iron nail / came under fire / a stale burger

The mass of the earth is $6\times {10}^{24}kg$. The distance between the earth and the Sun is $1.5\times {10}^{11}m$. If the gravitational force between the two is $3.5\times {10}^{22}N$, what is the mass of the Sun? Use $G=6.67\times {10}^{-11}N{m}^{2}k{g}^{-2}$

Define the term resistance. State its S.I. Unit.

What is a lens ? Distinguish between a convex lens and a concave lens. Which of the two is a converging lens : convex lens or concave lens ?

List some uses of convex and concave lens.

What is the minimum value of the refractive index for a ${90}^{\circ }–{45}^{\circ }–{45}^{\circ }$ prism
which is used to deviate a beam through ${90}^{\circ }$ by total internal reflection ?

Name the S.I. unit of heat.

The decrease of resistance in parallel combination is due to:

Strength of induced current is increased when

The lens which is used to correct myopia (shortsightedness) is

Write a short note on 'Chipko Andolan" (Hug the Trees Movement).

Find out the angle of deviation in the diagram shown above.

We can burn a piece of paper by focussing the sunrays by using a particular type of lens. Name the type of lens used for this purpose.

Which of the following waves can be polarized?

For any liquid, vapour pressure increases with increase in

Define calorific value of a fuel.

A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency :

(a) 128 Hz (b) 256 Hz

(c) 384 Hz (d) 512 Hz.

A simple pendulum performs simple harmonic motion about x = 0 with an amplitude (A) and time period (T). The speed of the pendulum at $x=\frac{A}{2}$ will be

What is the post war international economic system also known as?

Two boys were playing with a ball on a level ground. One of the boys throws the ball on the third floor of the building which is at a height of 5m and the other boy manages to throw on the fourth floor which is at a height of 7m from the level ground. The ratio of work done by both the boys is

How is the resistance of a wire affected if its (a) length is doubled, (b) radius is doubled?

Dimensions of coefficient of viscosity are

Define unbalanced forces.