NSO - Mock Test - 2

The pattern followed is: + 4, + 4 + 4.

B + 4 = F, F + 4 = J = BFJ
C + 4 = G, G + 4 = K = CGK
D + 4 = H, H + 4 = L = DHL

Similarly,
E + 4 = I, I + 4 = M = EIM

The pattern followed is: + 3, + 3, + 3.
So, LIGHT = L + 3 = O, I + 3 = L, G + 3 = J, H + 3 = K, T + 3 = W
hence, OLJKW
So, SOUND = S + 3 = V, O + 3 = R, U + 3 = X, N + 3 = Q, D + 3 = G
Hence, VRXQG

An actor performs in a play. A musician performs at a concert. Choices 1, 3 and 4 are incorrect because none is people who performs.

The pattern is as follows:
13 × 3 + 1 = 40
40 × 3 + 1 = 121
121 × 3 + 1 = 364

Baby of a dog is called puppy. Baby of a horse is called foal.

The part of leaf through which it is attached to the stem is petiole.

Switch is used to either break the electric circuit or to complete it.

A switch is an electrical component that can "make" or "break" an electrical circuit, interrupting the current or diverting it from one conductor to another.

High tide, extreme rainfall, and storms over oceans can bring a lot of water with them by pressure causing floods.

By eating rice alone, we cannot fulfil nutritional requirement of our body.

A compass can be used to find East-West direction at any place.

When a person shoots a bullet, he gets a pull back on his shoulder because every action has equal and opposite reaction.

The size of a shadow depends on the distance of source of light and on the angle at which the light rays fall on the object.

Higher speed is indicated by the following statements:

(i) Given distance has been covered in a shorter time.
(iii) Larger distance is covered in a given time.

Lightning rod is the device used to secure tall buildings from the effect of lightning. A metal rod taller than the height of the building is installed in the walls of the building during its construction which protects the building from the effect of lightning.

Tyndall effect, also known as Tyndall scattering, is light scattering by particles in a colloid or else particles in a very fine suspension. It is named after the 19^th-century physicist John Tyndall.

The passage of an electric current through a conducting liquid causes chemical reactions.

If a person comes near a fast moving train, then the train will attract its body towards itself. Its because of Bernoulli effect. As you get close to the a fast moving train, the air right next to the train is travelling at approximately the same speed as the train. As the air velocity goes up, the local static pressure goes down (conservation of energy). The lower static pressure near the train pulls a person's body towards itself.

A cylinder object can cast shadows in two ways. When the top circular view faces the shining object, a circular shape shadow is formed. When its curved side faces the shining object, it casts a rectangular shadow.

Refraction is change of direction that light undergoes when it enters a medium with a different density from the one through which it has been travelling, e.g. when, after moving through air, it passes through a prism. Sound waves are known to refract when travelling over water. Radio waves are refracted by different layers in the Earth's atmosphere. This leads to a reduction in the signal, making it difficult for them to be received over long distances.

Living beings use air for respiration.
Plants use air (carbon dioxide) to prepare their food.
Blowing air (wind) is used for power generation by windmills.
Air helps in burning of fuels and substances.
Air helps in the scattering of seeds and pollens of plants.
Air helps in the movements of sailing yachts, gliders, parachutes and aeroplanes.

It happens due to the condensation of water vapour present in the air.
Air contains water in the form of vapour which condenses on contact with the cold surface of the water bottle which drips down to create a small puddle.

Reflection on a plane mirror is an example of a regular reflection.
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.

Accelerated motion is a type of motion in which the velocity of an object changes by an equal amount in every equal time period.

The processes of distillation is used to separate salt and water from a solution.
It involves evaporation of water which leaves salt behind followed by condensation of steam to from water again.

Winnowing is a process by which substances having different weights can be separated and wind is the agent for separation in this method.
The mixture is thrown from a height and simultaneously subjected to the influence of blowing wind.
The lighter particles are blown by the wind and fall in a separate heap.

Salt from the sea water and milk powder from the solution can be separated by evaporation.
The water evaporates, leaving behind the non-volatile solute.
Water in an earthen pot remains cool as it evaporates from the surface of the pot because evaporation has a cooling effect.

Sublimation is a reversible change. When a substance sublimes on heating, it changes directly from the solid to gaseous state without passing through the liquid state. Desublimation, or deposition, is the reverse of this process in which a gas is directly converted into solid state on cooling.
Therefore, sublimation is a reversible change that can be undone or reversed.

If you leave a piece of iron outside, before long, it turns brown and crumbly. This rust is a completely new substance. You cannot easily turn it back into the iron you started with. So, rusting of iron is an irreversible change because an irreversible change is a change that cannot be undone or reversed.

A change that occurs at periodic intervals of time is called a periodic change. So, 'phases of moon' is a periodic change as it occurs at periodic intervals of time.

Herbivores animals are those that eat plants. They include sheep, rabbits, hyenas, cows, zebras and deer. They have sharp front teeth, used for biting, and large back teeth, used for grinding.

Biotic factors are the living components of an ecosystem, and are sorted into three groups: Producers or autotrophs, consumers or heterotrophs, and decomposers or detritivores. Bacterium is a biotic factor.

Cockroaches take in air through tiny openings in their bodies which are known as spiracles.

Osteomalacia is the softening of the bones, caused by impaired bone metabolism, primarily due to inadequate levels of available calcium.

Vitamin A is a fat-soluble vitamin. So, it needs fat for its absorption.

'Almonds' are one of the best sources of vitamin E.

Vitamin K helps in blood-clotting mechanism during injury. It is present in cabbage.

There are many animals that bear a thick coat of hair on their bodies. Such animals generally live in cold climates. Thick coat of hair over the body of such an animal traps lot of air and keeps them warm, as air is a bad conductor of heat, and that thick layer is used to obtain wool.

Sorting is the process of separating hair of different textures during the processing of wool.
It is done after scouring.

Burrs are the small, fluffy fibres, which are picked out from the hair of wool-yielding animals. Burrs produce many tiny bristles that easily attach to clothing when they come into contact with it.

Proteins are called the body-building foods as they help muscles to grow. Carbohydrates are called energy-giving foods as they provide essential energy to the body to work. Vitamins do not provide any energy to the body, but help in keeping the body healthy.

Steps involved in the process of recycling paper:

• Paper is torn into small pieces.
• Soak these pieces in water for a day.
• Make a thick paste and spread it on a net or sieve.
• Let water drain off completely.
• Use an old cloth or newspaper to remove the extra water from the paste and dry it.
• Use this paste to get beautiful patterns.