Gases do not have ________

The process of selective movement of substances through semi-permeable membrane is called

The distance travelled by a freely falling body is proportional to the

The value of acceleration due to gravity near the earth's surface is

A body is acted upon by a force which is proportional to the distance covered. If distance covered be denoted by S, then work done by the force will be proportional to

When ice melts there is a ............ in volume.

Common salt is obtained from sea water by ................

One of the major characteristics considered for classifying all organisms is whether they are made of ............ or ........... cells.

Uneven heating of air over land and water bodies causes ............

Proper care and management of farm animals is called.................................... .

What is the utility of tissues in multi-cellular organisms?

Why does an athlete always run some distance before taking a long jump?

Give three reasons to support that brass is a mixture, not a compound.

If one mole of carbon atoms weighs 12 grames, what is the mass of 1 atom of carbon?

What is atomic number ?How has this concept improved the definition of an element?

(a) What is Coelom?
(b) The presence of 'coelom' in an animals body is considered as advantageous. Why?

Why are seat belts provided in automobiles and aeroplanes?

While determining the density of the material of metallic sphere using a spring balance and measuring cylinder, Ruby noted the following readings:
(i) Mass of the sphere = 81 g
(ii) (a) Reading of water level in the cylinder without sphere = 59 mL
(b) Reading of water level in the cylinder with sphere = 68 mL
On the basis of these observations, find the density of the material of the sphere.

A body of mass 5 kg is thrown vertically upwards with a speed of 10 m/s.What is its kinetic energy when it is thrown? Find its potential energy when it reaches at the highest point.Also find the maximum height attained by the body.

How is ultrasound used for cleaning?

Compare the use of manure and fertilizers in maintaining soil fertility.

How will you separate the mixture of petrol and water?Write it with the help of labelled diagram with four labels.

What is the utility of the mole concept?

Write down the hierarchic categories which are generally used for classification of animals.

Two objects, each of mass 1.5 kg, are moving in the same straight line but in opposite directions, The velocity of each object is \(2.5 m s^{-1}\) before the collision during which they stick together. What will be the velocity of the combined object after collision?

Two bodies of masses 3 kg and 12 kg are placed at a distance 12 m. A third body of mass 0.5 kg is to be placed at such a point that the force acting on this body is zero. Find the position of that point

Define the term 'tone'.A person id listening to a sound of 500Hz sitting at a distance of 450m from the source of the sound.What is the time interval between successive compression reaching his ears from the source?

What management practices are common in dairy and poultry farming?

What is the physical state of water at:
(a) \(250°C\)   (b) \(100°C\)

What are the three differences between plants and animals?

State any three differences between mass and weight.