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State the two laws of reflection of light.

One of the following does not apply to a concave mirror. This is : (a) focal length is negative (b) image distance can be positive or negative (c) image distance is always positive (d) height of image can be positive or negative

Anshuman stands 60m in front of a wall and clapping continuously with constant interval. He finds that the time taken between one and ${26}^{th}$ clap is 9 seconds. The speed of sound if the clap and the echo coincide is -

The colour of sky, in direction other than of the sun, is blue. Explain.

What percentage of the Sun's total energy output is received by the Earth?

The figure below is a representation of a simple harmonic progressive wave, progressing in the negative X- axis, at a given instant. The direction of the velocity of the particle at state P in the figure is best represented by the arrow.

Why is the colour of pupil black for every person's eye?

Light travels in a ___ .

Write a short note on the stakeholders of a forest. [3 MARKS]

If the power of a lens is + 0.1 D and if an object of size 2 m is placed 5 m before the lens. Find the size and position of the image formed?

A thin prism having refracting angle ${10}^o$ is made of glass of refractive index $1.42$. This prism is combined with another thin prism of glass of refractive index $1.7$. This combination produces dispersion without deviation. The refracting angle of second prism should be

Choose the quantity of fuel from the given options which will produce more heat (Calorific value of 1 kg of Z is 50,000 kJ/kg).

Suppose a room has a magnetic field, directed downwards. Then in which way should the straight conductor be placed in order to experience maximum magnetic force?

What name is given to the ratio of sine of angle of incidence to the sine of angle of refraction ?

Choose the incorrect statement from the following regarding magnetic lines of force:

1. 24

The time period of a satellite in a circular orbit around a planet is independent of______.

Consider the situation shown in the figure below. Water $({\mu }_w=\frac{4}{3})$ is filled in a beaker up to a height of $10cm$. A plane mirror is fixed at a height of $5cm$ from the surface of the water. The distance of the image of an object O kept at the bottom of the beaker, from the mirror will be:

An air bubble in a glass slab $(\mu =1.5)$ is 6 cm deep when viewed from one face and 4 cm deep when viewed from the opposite face. The thickness of the glass plate is:

There is a straight wire carrying current as shown in the figure. What is the direction of the magnetic field around the wire when the reference point is above the wire?

Which of the following option(s) is/are correct?

In the year ___ Amrita Devi sacrificed her life for the protection of Khejri trees in Rajasthan?

During the course of a turn, an automobile doubles its speed. What change will we observe in centripetal force?

What is solar energy ? How is the solar energy used to generate electricity in a solar power plant ?

Which of the following statements is/are correct according to the above passage?

Select the correct code:

Newton’s third law of motion states that for every action, there is an equal and opposite reaction. Which of the following statements can be inferred from the above-mentioned law of motion?

Statement 1$:$ In every interaction, there is a pair of forces acting on the two interacting objects.

Statement 2$:$ The size of the force on the first object equals the size of the force on the second object.

Statement 3$:$ Forces always come in pairs - equal and opposite action-reaction force pairs.

Statement 4$:$ Action and reaction act on the same body.

Statement 5$:$ Action and reaction act on two different bodies.

During the sunrise, the sun appears _____

A pendulum is oscillating on either side of its rest position. Explain the energy changes that takes place in the oscillating pendulum. How does the mechanical energy remain constant in it? Draw the necessary diagram.

How a generator work

If the resistance between two terminals of an electric heater is 15Ω and an electric current of 15 A is flowing

through it then what will be the voltage of electric current?

If the initial velocity of $m_1$ is v $\frac{m}{s}$ and initial velocity of $m_2$ is 2 v $\frac{m}{s}$. After collision $m_2$ stops, then what is the final velocity of $m_1$ after the collision? If $m_1$ = m kg and $m_2$ = 2m kg.

Give any three characteristics of the material used for making heating appliances.

In which case we should use ohm's law .

Match List – I with List – II and select the correct answer.

Why is magnet placed in a speaker

A ray of light is incident on medium 1 with the refractive index of 1 from a medium 2 with the refractive index of $\sqrt{2}$. Find the deviation of the emergent ray in the given diagram (with respect to first incident ray).

Where should an object be placed in order to use a convex lens as a magnifying glass ?

A substance is in the form of a solid at 0 °C. The amount of heat added to this substance and the temperature of the substance are plotted on the graph.

Amount of heat (in Joule)

If the specific heat capacity of the solid substance is 500 J/kg °C, find from the graph; the mass of the substance;

In 10 s, a charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit as a result.
(a) What is the p.d. across the battery?
(b) What current flows from the battery?

How would the sky appear when seen from the space (or moon) ? Give reason for your answer.