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In the case of a drum, if we increase the tension of the stretched membrane, what will happen to the pitch of the sound produced?

What is the scientific definition of newton ?

A trolley with load on it is moving on a flat plane. The force felt by the trolley due to the load is $F$. What is the work done by this force if the trolley moves a distance $d$?

What is difference between rotatory motion and circular motion ?

A uniform motion can be characterized as:-

On account of _______ reflection, an object becomes visible.

Himanshu tried to hit a target with a jet of water, so he punched a hole in the container. But he missed the target as shown in the figure.

Where should he punch the next hole?

Which is the next nearest star to the earth after the sun?

Which of the following plays an important role as the early warning system?

Select the correct statement(s) among the following?

Which of these is not a property of a true Beam-balance?

An iron ball at temperature of ${45}^{\circ }C$ is dropped in a glass of water. What is the temperature of water, if there is no heat flow between water and the iron ball?

Himanshu has three buckets as shown below. He puts his right-hand in bucket A and left-hand in bucket B. He then puts both of his hands in normal water. His right-hand feels that the water here is hotter while his left-hand feels that the water here is colder.

Select the correct option:

Which of the following is symbol of bulb?

If the density and volume of a wooden block are $1.2g/c{m}^3$ and $60c{m}^3$respectively, then find the mass of the wooden block.

What form of energy is possessed by waves?

What is the value of the unknown angle (θ) in the following diagram?

Distinguish between uniform and nonuniform motion give an example of each

Which of the following energy conversions is depicted in the figure given below?

1. Sea breeze:When land gets heated,warm air rises and cold air from sea come towards the land. (The land here is a low pressure area. Sea is a high pressure area.This shoes that air moves from high pressure area to low pressure area.)
2. Air coming from poles towards equator:Equator area receive high heat from the sun. As a result,it becomes a low pressure area and rises up. The cold air from the polar regions come towards the equator . (Here,polar region is a region of high pressure.)
3. No winds at hill stations:On hill ststions,there will be no wind because there is high air pressure.Air moves from a region of high air pressure to low air pressure.So, there will not be any wind in hill stations.

What are the various reasons for excessive current in electric circuits? What can we do to prevent them? [3 MARKS]

If the distance-time graph is a straight line parallel to time axis, it indicates that the object is

A yellow source of light is placed in front of three cardboards having openings A, B, C and D, where A, C, D are collinear as shown below.

From which of the openings will the light source be visible?

Which of the following are not considered as a source of light?

Which of the following statement(s) is/are true about the eye of a cyclone?

Why can't we design a laboratory thermometer with the kink so that we can record the temperature even after removing it out of the beaker?

Explain the term chime

Study the following pie charts carefully and answer the questions given below them.
Q. What is the central angle corresponding to the total number of members in health clubs A and C taken together?

Why is it so that if you can see another person in a mirror, he/she can also see you?

A boy tied a string to one of the ends of a box and started sliding the box on a large circular track. The work done by the force applied by the boy is:

___is the surest test for magnetism.

Explain an example where heatis transferred by all the three mean that is conduction,convection and radiation.

A boy starts on the corner of a square field of side $a$. He chases a rabbit and finally catches it on the opposite corner of the field. Find his displacement in the process.

What is speed in 5 marks

Q74. Laser Weapons system is launched by:

___ is a device used to measure temperature of a body.

Assuming Newton's law of cooling to be valid, the time taken by a body to cool from a temperature $T_1$ to a temperature $T_2$ in a room where the temperature is $T_0$ $(T_0<T_2<T_1)$ is proportional to

What is a constellation?

What make the wool so that we can wear it in winter, why make it hot