Question 1 1.2 / -0
Complete the following series:
Solution
The pattern followed is: + 4, + 4 + 4.
Question 2 1.2 / -0
If in a certain language, LIGHT is coded as OLJKW, how can SOUND be written in that code?
Solution
The pattern followed is: + 3, + 3, + 3.
Question 3 1.2 / -0
Play is to actor as concert is to
Solution
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.
Question 4 1.2 / -0
Complete the following number series:
Solution
The pattern is as follows:
Question 5 1.2 / -0
Select the related word to replace the question mark.
Solution
Baby of a dog is called puppy. Baby of a horse is called foal.
Question 6 1.2 / -0
Directions: Select the figure from the given options that will complete the following series.
Solution
The triangle rotates 90o clockwise in each step and also the number of small circle-like shapes is increased by 1 in each step.
Question 7 1.2 / -0
From the following options, choose the correct figure which uses Figure (X) as its part.
Figure (X)
Solution
Figure (X) contains an image of a triangle with a diamond in it. Among all the option figures, only figure (3) contains a diamond and triangle in it.
Question 8 1.2 / -0
Choose the appropriate option which resembles the perfect mirror image of the following figure:
Solution
Figure in the question is made of some numbers. We have to make its mirror image. The property of mirror image is to flip it horizontally. Figure D is only an image that is horizontal of the image given in the question.
Question 9 1.2 / -0
E is the son of A. D is the son of B. E is married to C. C is B's daughter. How is D related to E?
Solution
D is the brother-in-law of E.
Question 10 1.2 / -0
Choose a figure from among 1, 2, 3 and 4, which would most closely resemble the unfolded form of Figure (Z).
Solution
The final shape will have four triangular shapes with their vertices pointing inward. Only option 4 satisfies the condition.
Question 11 1.2 / -0
The part of leaf through which it is attached to the stem is ____________.
Solution
The part of leaf through which it is attached to the stem is petiole.
Question 12 1.2 / -0
Which of the following devices is used to either break the electric circuit or to complete it?
Solution
Switch is used to either break the electric circuit or to complete it.
Question 13 1.2 / -0
Consider the list of terms given below:
Solution
High tide, extreme rainfall, and storms over oceans can bring a lot of water with them by pressure causing floods.
Question 14 1.2 / -0
Which of the following statements is FALSE?
Solution
By eating rice alone, we cannot fulfil nutritional requirement of our body.
Question 15 1.2 / -0
Which of the following statements is TRUE about magnet?
Solution
A compass can be used to find East-West direction at any place.
Question 16 1.2 / -0
Why does a person get a jerk back when he shoots a bullet off a piston?
Solution
When a person shoots a bullet, he gets a pull back on his shoulder because every action has equal and opposite reaction.
Question 17 1.2 / -0
On which of the following factors does the size of a shadow depend?
Solution
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.
Question 18 1.2 / -0
Which of the following are indications of higher speed?
Solution
Higher speed is indicated by the following statements:
Question 19 1.2 / -0
In which of the following circuits will the bulb glow?
Solution
The circuit shown in option 4 is complete, so the bulb will glow in this cicuit.
Question 20 1.2 / -0
Which of the following devices is used to secure tall buildings from the effect of lightning?
Solution
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.
Question 21 1.2 / -0
______ is light scattering by particles in a colloid or else particles in a very fine suspension.
Solution
Tyndall effect, also known as Tyndall scattering, is light scattering by particles in a colloid or else particles in a very fine suspension. Consequently, the path of light as it travels through the medium becomes visible.th -century physicist John Tyndall.
Question 22 1.2 / -0
The passage of an electric current through a conducting liquid leads to
Solution
The passage of an electric current through a conducting liquid causes decomposition reactions. The process is referred to as electrolysis.
For example, electrolysis of water in the presence of a few drops of an acid causes it to decompose into hydrogen gas and oxygen gas.
Question 23 1.2 / -0
If a person comes near a fast moving train, then the train will
Solution
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.
Question 24 1.2 / -0
Which of the following options is TRUE?
Solution
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.
Question 25 1.2 / -0
Consider the following statements and choose the appropriate option.Statement I: When a wave is refracted, its frequency gets changed.Statement II: 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.
Solution
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 Earth's atmosphere. This leads to a reduction in the signal, making it difficult for them to be received over long distances.
Question 26 1.2 / -0
Which of the following is not true about air?
Solution
Air does not play a direct role in the occurrence of rains.
Hence, option (3) is correct.
However, it is useful in many ways, as mentioned below:
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.
Question 27 1.2 / -0
Take out a cold bottle of water from the refrigerator and keep it on a table. After some time, you will notice a puddle of water around it.
Solution
It happens due to the condensation of water vapour present in the air.
Question 28 1.2 / -0
Which of the following is an example of a regular reflection?
Solution
Reflection on a plane mirror is an example of a regular reflection.
Question 29 1.2 / -0
It is a type of motion in which the velocity of an object changes by an equal amount in every equal time period. What is this motion called?
Solution
Accelerated motion is a type of motion in which the velocity of an object changes by an equal amount in every equal time period.
Question 30 1.2 / -0
Distillation is a method used for purification of water and for separation of two miscible liquids. This process is in fact a combination of two processes, which are:
Solution
Distillation is a two-step process:
Question 31 1.2 / -0
Which of the following processes uses wind to separate the substances?
Solution
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 husk particles are blown by the wind and the heavier seeds fall in a separate heap.
Question 32 1.2 / -0
'Z' is a physical change that has many different applications, some of which are:
Cooling water in an earthen pot Obtaining salt from sea water Working of a desert cooler The process 'Z' is:
Solution
Salt from sea water is separated by evaporation. Water evaporates, leaving behind the non-volatile solute. Evaporation has a cooling effect and this is the principle for the working of a desert cooler.
Question 33 1.2 / -0
Which of the following actions is a cause of water pollution?
Solution
The excessive chemicals used in the fields get washed into the water bodies and pollute them. This not only has an adverse effect on aquatic life, but also these chemicals enter the food chain when the water is consumed by the milch cattle.
Question 34 1.2 / -0
Observe the following Venn diagram:
Which of the following changes represents X?
Solution
Iron objects in the presence of moisture and air develop a crumbly, flaky coating of a reddish brown substance called rust.
Question 35 1.2 / -0
Which of the following is a periodic change?
Solution
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.
Question 36 1.2 / -0
Refer to the flowchart given below and choose the incorrect statement.
Solution
Deer has strong teeth for chewing hard plant stems of the forest. They do not help the deer to fight with predators.
Question 37 1.2 / -0
Identify X in the figure given below:
Solution
The correct identification of X is vascular bundle. A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in vascular tissue, which exists in two forms: xylem and phloem. Both these tissues are present in a vascular bundle.
Question 38 1.2 / -0
The tiny openings in the body of a cockroach through which it takes in air are known as
Solution
Cockroaches take in air through tiny openings in their bodies which are known as spiracles.
Question 39 1.2 / -0
Which one of the following diseases is caused due to deficiency of calcium?
Solution
Osteomalacia is the softening of the bones, caused by impaired bone metabolism, primarily due to inadequate levels of available calcium.
Question 40 1.2 / -0
Which one of the following vitamins requires fat for its absorption?
Solution
Vitamin A is a fat-soluble vitamin. So, it needs fat for its absorption.
Question 41 1.2 / -0
Which one of the following foods is rich in vitamin E?
Solution
Almonds are one of the best sources of vitamin E.
Question 42 1.2 / -0
Match the items in column A with their functions in column B.
A B I. Proteins x. Energy-giving food II. Carbohydrates y. Keep the body healthy III. Vitamins z. Body-building food
Solution
Proteins are called body-building foods as they help muscles to grow.
Question 43 1.2 / -0
Observe the flowchart given below and select the correct statements about the processes P, Q and R.
I. Process P is endothermic.
II. The change brought about by process Q can be reversed on cooling.
III. Process R is usually observed during summer.
IV. Process R is exothermic
Solution
Process P is fusion or melting. Since heat is utilised during the process, it is endothermic.
Process Q is vaporisation or boiling. Since heat is utilised during the process, it is endothermic.
This change can be reversed on cooling and the process is called condensation.
During severe winter, water droplets in the atmosphere freeze to form frost. Heat is released during this process and R is exothermic.
Hence, statements I, II and IV are correct.
Question 44 1.2 / -0
Which of the given substances are not pure and can have a variable composition?
Solution
Mixtures have molecules of more than one type in their composition and are not pure substances. They do not have any fixed composition.
Question 45 1.2 / -0
Some points have been listed down while studying about biodegradable and non-biodegradable waste, and recycling and reusing the waste materials.
Solution
Steps involved in the process of recycling paper are:
Question 46 1.2 / -0
The following picture shows different types of objects with different kinds of motion. Select the answer which matches them correctly.
Solution
In this case, we know that A shows an up and down motion, B shows a train in straight line motion, C shows a girl on the swing which is a back and forth motion, D shows zig zag motion of a snake.
Question 47 1.2 / -0
Identify the paramecium from the options given below:
Solution
Option B is the paramecium. A paramecium is a small one-celled (unicellular) living organism that can move, digest food, and reproduce. The locomotory organ in a paramecium is cilia.
Question 48 1.2 / -0
Carefully observe the diagram given below:
Choose the incorrect option regarding the process shown above.
Solution
The process shown in the diagram is germination. Germination is the process of seeds developing into new plants. The presence of light, water and warmth is essential for the process to take place. Seeds remain dormant if these conditions are not met. As the process of germination starts, all the metabolic activities including respiration speed up. Root is the first part of the seed that comes out in the soil and anchors the seedling in the soil. Germination is essential for the continuity and propagation of flowering plants.
Question 49 1.2 / -0
Study the dichotomous key and identify the type of change represented by W, X, Y and Z.
I. (i) It is a man-made fibre: W
(ii) It is a natural fibre. Go to II.
II. (i) It is a natural mineral fibre: X
(ii) It is a plant fibre. Go to III.
III. (i) The crop is usually grown at places having black soil and warm climate: Y
(ii) It is cultivated during the rainy season: Z
W X Y Z A Nylon Asbestos Cotton Jute B Spandex Asbestos Jute Coton C Nylon Spandex Cotton Jute D Asbestos Spandex Cotton Jute
Solution
W is a man-made fibre and could be nylon or spandex.
Question 50 1.2 / -0
In the following images, contact forces and non-contact forces have been shown.
Choose the option in which images are correctly labelled.
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