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Two plane mirrors are at 45${}^{\circ }$ to each other. If an object is placed between them, then the number of images will be

An incident ray which passes through the principal focus, after reflection on a concave mirror, emerges.....................

Choose the medium from the given options in which sound will have the highest speed.

How does a fuse help to prevent damage in case current exceeds the permissible value?

State whether the following statement is true or false :
The image formed on our retina is upside-down

Study the diagrams given below.

(a) Name the lens LL'.

(b) What are the points O and O' called ?

(c) Complete the diagram to form the image of the object AB.

(d) State the three characteristics of the image.

(e) Name a device in which this action of lens is used.

A movable pulley system consists of three movable pulleys and one fixed pulley. Calculate the distance moved by the load when effort moves by 80cm

A bulb filament allows passage of 2A current when connected to a 220V supply & that of 1.1A when connected to 110V. Does the filament obey Ohms law or not? Why?

A particle of mass m is observed from an inertial frame of reference and is found to move in a circle of radius r with a uniform speed v. The centrifugal force on it is

Why LASER cannot be dispersed?

What is the function of a key (or switch) in an electric circuit ?

A uniform chain of length $l$ is placed on the table in such a manner that length $l^{\prime }$ of it is hanging over the edge of the table without the chain sliding. If the coefficient of friction between the chain and the table is $\mu$ then find the maximum length of chain $l^{\prime }$ that can hang without the entire chain slipping.

Why is the loudness of the sound heard by a plucked wire increased when it is mounted on a sound board?

Name the three classes of levers and state how are they distinguished. Give two examples of each class.

The sphere shown in figure lies on a rough plane when a particle of mass 'm' traveling at a speed $v_0$ collides and sticks with it. If the line of motion of the particle is at a distance h above the plane, find the angular speed of the combined system just after the collision. Assume that the mass M of the sphere is large compared to the mass of the particle so that the center of mass of the combined system is not appreciably shifted from the center of the sphere.

Name the device used to (a) increase the voltage at the generating station, and (b) decrease the voltage at the substation for its supply.

A person suffering from an eye defect uses a lens of power -1D. Name the defect he is suffering from and the nature of the lens used

The dashed part of the thin lens is cut out and kept on the $x$ axis as shown in the diagram. If parallel paraxial rays are falling on this system then the coordinate of image formed after refraction from both the lenses is $(30,–1)$. If $x=2.5,$ then (all the distance is in cm) (Assume that the lens have no spherical aberration):

Draw the pattern of magnetic field lines of a current carrying solenoid. What does the pattern of field lines inside the solenoid indicate? Write one application of magnetic field of current carrying solenoid.

Discuss the position and nature of image formed by a convex mirror when an object is moved from infinity towards the pole of mirror.

On reducing the focal length of a lens, its power:

Question 14
Match the physical quantities given in column A to their SI units given in column B:
$\begin{array}{cc}\text{(A)}& \text{(B)}\\ \text{(a)Pressure}& \text{(i)cubic metre}\\ \text{(b)Temperature}& \text{(ii)Kilogram}\\ \text{(c)Density}& \text{(iii)pascal}\\ \text{(d)Mass}& \text{(iv)Kelvin}\\ \text{(e)Volume}& \text{(v)Kilogram per cubic metre}\end{array}$

Differentiate between work and power.

The device used for converting mechanical energy to electrical energy is called a/an________.

The above diagram is the arrangement for observing scattering of light in colloidal solution, why does the beaker appear orange-red when seen through the slit MN?

Why is centrifugal force called a fictional force?

What are the meaning of expand and relaxation in eye ?

10A OF CURRENT PASSING THROUGH A CONDUCTOR IN MIN. FIND NUMBER OF ELECRON CROSSING THROUGH THE CONDUCTOR.

The correct representation for Charles' law is .

The number density of electron in copper is 8.5 × 10²⁸ m^-3. What is the current flowing through a copper wire of length 0.2 m, area of cross-section 1 mm² when connected to a battery of 4.0 V? Given that electron mobility = 4.5 × 10^-6 m²V^-1s^-1 and charge on the electron is 1.6 × 10^-19 C.

The pH of a sample of water collected from a river is found to be in the range of 3.5 to 4.5. The most likely reason for this is the waste being discharged into the river from a:
(a) soap and detergent manufacturing factory
(b) car battery manufacturing factory
(c) alcohol manufacturing factory
(d) plastic cups moulding factory

What will be the shape of a rainbow when viewed from the terrace of a house and an aircraft flying very high respectively?

A $10cm$ tall candle when viewed using a convex lens appears to be $20cm$ tall as shown in the below figure. The focal length of the lens is $5cm$. What is the object distance?

The diagram below shows a uniform bar supported at the middle point O. A weight of 40 gf is placed at a distance of 40 cm to the left of the point O. How can you balance the bar with a weight of 80 gf?

In the network shown in the figure, calculate the equivalent resistance between the points (a) A and B, and (b) A and C.

Draw a diagram of a lever which is always used as a force multiplier. How is the effort arm related to the load arm in such a lever ?

Complete the following sentence:

The conversation of part of energy into an undesirable form is called ..............

If lens A has focal length $+15cm$ and lens B has focal length $+30cm$, find out which lens has more power?

Choose the ray diagram which shows the image formation for object placed at center of curvature of concave mirror.

In the given set up resistors A, B & C are of resistance 1 ohm each.

Find the current through resistor A and Potential difference across it, if the resistance of the wire is zero.

1. 400

a ray of light is incident at 60° on glass air interface .what will be the light ray ?

The gravitational unit of force is

(a) An object is placed just outside the principal focus of concave mirror. Draw a ray diagram to show how the image is formed, and describe its size, position and nature. (b) If the object is moved further away from the mirror, what changes are there in the position and size of the image ? (c) An object is 24 cm away from a concave mirror and its image is 16 cm from the mirror. Find the focal length and radius of curvature of the mirror, and the magnification of the image.