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The 8cm chord has shortest distance of 3cm from the center. What is the area of the circle?

One of your friends in your class is wearing a convex lens to correct his vision. He is suffering from which of the following visual defects?

What is light?

To get a laterally inverted image of any geometrical shape we use___.

Question 5

Explain why a charged body loses its charge if we touch it with our hand.

How should a ray of light be incident on a mirror, in order that the reflected ray comes downwards? Which plane will contain these two rays and the normal?

A beaker contains water up to a height $h_1$ and K oil above water up to another height $h_2.$ Find the apparent shift in the position of the bottom of the beaker when viewed from above. Refractive index of water is ${\mu }_1$ and that of K.oil is ${\mu }_2.$

Select the safe measure(s) to be taken to protect ourselves against lightning strike.

Some mustard oil is kept in a beaker. It will exert pressure:
(a)downwards only (b) sideways only (c) upwards only (d) in all directions

A conducting wheel in which there are four rods of length $l$ is rotating with angular velocity $\omega$ in a uniform magnetic field $B$. The induced potential difference between its centre and rim will be:

Positive and positive charge Repel then why are the protons inside nucleus of atoms held tightly together?

On a winter day, sound travels $336\text{meters}$ in $\text{one second}$. Find the atmospheric temperature. Speed of sound at $0{}^{\circ }\text{C}$ is $332{\text{ms}}^{-1}$.

A flashlight is lit inside a dark room. Select the path in which the light travels.

What happens when earthing is not done for a lightning conductor?

The emf of a storage battery is 90 V before charging and 100 V after charging by a direct current voltage supply. When charging began the current was 10 A. What is the current at the end of charging if the internal resistance of the storage battery during the whole process of charging may be taken as constant and equal to 2 ohms?

Suraj can open a $2m$ wide door by applying a force of $2.5N$ at the free end of the door. Find the moment of force needed to open the door.

Which one of the following class I lever has the mechanical advantage more than 1?

Why is water spilled purposely on the slides in water parks? [2 MARKS]

How does light travel and if it does not need any medium then any obstacle can't stop it from penetrating it but this is actually done how

Match the following.

If $\hat{i}$ denotes a unit vector along an incident ray, $\hat{r}$ a unit vector along the refracted ray into a medium of refractive index '$\mu$' and $\hat{n}$ a unit vector normal to the boundary of the media directed towards the incident medium, then

$[$consider the first medium to be air$]$

It is easy to pull the bucket as long as it is inside water, but as soon as it starts coming out of the water, it appears to become heavy because of

Read the passage and answer the question that follows.
​​​​​​​
Most bicycle helmets provide good protection for the top and back of the head, but little or no protection for the temple regions on the sides of the head. A study of head injuries resulting from bicycle accidents showed that a large proportion were caused by blows to the temple area. Therefore, if bicycle helmets protected this area, the risk of serious head injury in bicycle accidents would be greatly reduced, especially since ___.
Which of the following most logically completes the passage?

How is the strength of a force usually expressed?

While standing before a plane mirror, if you move your right hand to the right, which hand does your image move? [3 MARKS]

Light takes $8$ minutes to reach the earth from the sun. Which of the following is correct?