Question 1 1.2 / -0
The question figure is embedded in one of the answer figures given below. You have to find out that answer figure and mark the answer.
Solution
Question figure is embedded in answer figure B.
Question 2 1.2 / -0
One of the answer figures A, B, C, or D contains the mirror image of the question figure. Find the correct mirror image of the question figure.
Solution
Answer figure C is the correct mirror image of the question figure.
Question 3 1.2 / -0
How many triangles are there in the figure given below?
Solution
There are 14 triangles i.e., ACG, ACE, AGE, BDE, BFE, BDF, EIJ, EKJ, EIK, BHJ, BLJ, BHL, CDH and FGL.
Question 4 1.2 / -0
A square sheet of paper is folded in a certain manner and then a part of it is cut out. It is shown with the help of the question figure given below. Out of the four answer figures A, B, C and D given below, choose the one that represents the sheet after being unfolded.
Solution
It will appear like answer figure D after unfolding.
Question 5 1.2 / -0
Which of the following four diagrams best depicts the relation between Milky way, Earth and Moon?
Solution
Figure D best depicts the relation between Milky way, Earth and Moon, as both Earth and Moon are parts of Milky way.
Question 6 1.2 / -0
Choose the odd one out from the following options.
Solution
Except Venus and Mercury, all the other planets have their natural satellites. So, Venus is the odd one among the given options.
Question 7 1.2 / -0
Find the alternative which will replace the question mark (?). 5 : 26 :: 7 : ?
Solution
The relation here is n : n2 + 1 5 : 52 + 1 = 26 7 : 72 + 1 = 50
Question 8 1.2 / -0
The number written inside each triangle has some relation with the three numbers written on the vertices of the triangle. Find the number which will come in place of the question mark.
Solution
Triangle 1: (7 – 5) × 4 = 2 x 4 = 8 Triangle 2: (6 – 1) × 3 = 5 × 3 = 15 Triangle 3: (11 – 8) × 7 = 3 × 7 = 21
Question 9 1.2 / -0
In a certain code language, JAGUAR is coded as KBFTBS. How will CHITAL be coded in the same code language?
Solution
JAGUAR is coded as KBFTBS. First two letters are coded by their successors in the English alphabet, third and fourth letter are coded by their predecessors in the alphabet, and the last two letters are coded by their successors in the alphabet. C + 1 = D H + 1 = I I – 1 = H T – 1 = S A + 1 = B L + 1 = M Thus, CHITAL is coded as DIHSBM.
Question 10 1.2 / -0
Find the missing term in the given series: 7, 15, 19, 27, ?, 39, 43
Solution
The pattern is + 8, + 4, + 8, + 4, ...... 7 + 8 = 15 15 + 4 = 19 19 + 8 = 27 27 + 4 = 31 - Missing term 31 + 8 = 39 39 + 4 = 43
Question 11 1.2 / -0
Why do animals like frog and fish produce hundreds of eggs while hens and humans produce one egg at a time?
Solution
Fish lay a large number of eggs because only a few of them, out of thousands, will be fertilised and produce a fish. This is because they are fertilised outside of the body and are highly sensitive to temperature changes and external factors including predators.
Question 12 1.2 / -0
Which crops are grown between the months of March and June i.e., between Rabi and Kharif crop seasons?
Solution
In the Indian sub-continent, the crops grown on irrigated lands which do not have to wait for monsoons, or in the short duration between Rabi and Kharif crop seasons, mainly from March to June, are called Zaid crops.
Question 13 1.2 / -0
Which microorganism causes rust of wheat in leaves?
Solution
Wheat-leaf rust is a fungal disease that affects wheat. The fungus is an obligate parasite, which is capable of producing infectious urediniospores as long as infected leaf tissue remains alive.
Question 14 1.2 / -0
Which of the following options is TRUE?
Solution
All the multicellular organisms start their lives as a single cell. Nucleolus is situated inside the nucleus. Cell membrane is a biological membrane that separates the interior of all cells from the outside environment (the extracellular space) which protects the cell from its environment.
Question 15 1.2 / -0
Study the dichotomous key and identify W, X and Y: I. (i) A synthetic fibre that resembles wool: W (ii) A synthetic fibre formed by polymerisation of compounds with a fruity odour: Go to III. II. (i) Is woven into fabric: X (ii) Is used to make bottles and utensils: Z Which polyester fabric is used to make very fine yarn by which various dress materials are made?
Solution
Acrylic is a synthetic fibre which has properties that closely resemble those of wool. The fibre is soft and flexible, producing lightweight, lofty yarns. Terylene and PET are both polyesters made by polymerisation of esters, which are compounds with a fruity odour. Terylene is used to make fabric that does not get wrinkled easily and is quite suitable for making dress materials. PET (Polyethylene terephthalate) is a very familiar form of polyester. It is used for making bottles, utensils, films, wires, and many other useful products.
Question 16 1.2 / -0
Analyse the two statements given below and select the correct option.Statement I: The screwdriver used by an electrician has a handle made of graphite.Statement II: Graphite being a metal is a good conductor of electricity.
Solution
The screwdriver used by electricians while repairing electrical appliances is made of metal and metals conduct electricity. It is provided with a wooden or plastic handle because these materials are poor conductors of both heat and electricity. They insulate the body when in use and prevent electric shock. Therefore, statement I is incorrect. Graphite, an allotrope of carbon, is a non-metal. It is a good conductor of electricity due to the presence of free electrons in its lattice. Therefore, statement II is also incorrect.
Question 17 1.2 / -0
Which of the following statements are not correct? I. All metals have high melting points. II. Iodine crystals are lustrous because iodine it is a metal. III. Metals form ionic compounds with non-metals. IV. Bromine is the only non-metal which is liquid at room temperature.
Solution
Metals generally have high melting points, but mercury, cesium and gallium have low melting points. Mercury is liquid at room temperature, and cesium and gallium are liquids close to room temperature. Hence, statement I is incorrect. Although iodine exhibits metallic lustre, it is an electronegative element and is essentially a non-metal. Hence, statement II is incorrect. Statements III and IV are correct. Hence, option (2) is the correct answer.
Question 18 1.2 / -0
Which of the following is not a diatomic non-metal?
Solution
Sulphur is a polyatomic non-metal. It has the formula S
8 and exists as a puckered ring of 8 sulphur atoms.
Question 19 1.2 / -0
Fuels can be classified as natural (primary) fuels and derived (secondary) fuels.
Observe the following table and select the correct option to represent P, Q, R, S, T and U.
P Q R S T U A. Coke Diesel Coal gas Coal Crude oil Natural gas B. Coke Natural gas Crude oil Coal Coal gas C. Coal Coal gas Natural gas Coke Crude oil Diesel D. Coal Crude oil Natural gas Coke Diesel Coal gas
Solution
Coal, crude oil and natural gas are primary fuels. Coke, diesel and coal gas are secondary fuels. Coal and coal gas are obtained during the destructive distillation of coal and diesel is obtained during the destructive distillation of petroleum. Hence, option (4) is correct.
Question 20 1.2 / -0
Which of the following polymers is not resistant to heat?
Solution
Polyvinyl chloride is a thermoplastic and is not resistant to heat. Although teflon is also a thermoplastic, it has a very high melting point and is resistant to heat over a considerable range of temperature. It is therefore used for coating non-stick cookware. Melamine and bakelite are thermosetting plastics and are therefore resistant to heat.
Question 21 1.2 / -0
If a given sample of water has a high value of BOD, it indicates that
Solution
Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at a certain temperature over a specific time period. A high BOD indicates the presence of a large number of microorganisms, which suggests a high level of pollution. Hence, option (3) is correct.
Question 22 1.2 / -0
Which of the following options is TRUE?
Solution
Weeds are the unwanted plants growing along crops. They share the nutrients meant for plants and thus are harmful for crops. We can control weeds with the help of chemicals weedicides. The removal of weeds is called weeding. They are either removed manually or by chemicals. Manually this can be done with the help of Khurpi or Seed-drill. Weedicides are sprayed in the fields to kill the unwanted plants. These weedicides do not affect the main crop. Weeds are removed or killed during their vegetative phase before flowering or bearing of seeds.
Question 23 1.2 / -0
Diana, Dave and Cameron are working on a project in which they are burning a heap of green leaves, but they are finding difficulty in doing so. Why is it difficult to burn a heap of green leaves?
Solution
Diana, Dave and Cameron are finding difficulty in burning a heap of green leaves because it contains a lot of water and has a very high ignition temperature. As water is a natural fire extinguisher, it does not allow leaves to catch fire easily.
Question 24 1.2 / -0
Refer to the above flow chart and choose the major effect of A.
Solution
Desertification is caused by the removal of the top fertile layer of soil; thus, it makes the soil infertile.
Question 25 1.2 / -0
Directions: Read the two statements and choose the correct alternative. A: CO2 in the atmosphere causes global warming. R: CO2 traps the heat reflected by the earth.
Solution
Gases like carbon dioxide, methane, water vapour, ozone and nitrous oxide trap the heat radiated by the earth and are the main gases in the atmosphere responsible for global warming. Hence, both statements A and R are true and R explains A.
Question 26 1.2 / -0
Raman has a persistent high glucose level in his blood. Which of his glands may not be functioning properly?
Solution
Pancreas produces insulin. Deficiency of insulin caused diabetes.
Question 27 1.2 / -0
Which is the largest gland in the human body?
Solution
The largest gland in the human body is liver. It is also the largest (internal) organ in our body and can weigh up to 1.5-1.6 kg for a human adult.
Question 28 1.2 / -0
Three friends made the following statements: Mehak: Indian giant squirrel is found only in India. It is an X species. Shruti: Eichhornnia, now seen growing in ponds and lakes, was naturally not found in India. It is an Y species. Priyanka: Orangutan will no longer be seen on the earth if not conserved. It is an Z species. Identify the terms X, Y and Z and select the correct option.
Solution
Endemic species are species of those plants and animals which are found in just one particular region and nowhere else in the world. Animals and plant species introduced from other countries and which are not otherwise found locally are termed exotic. These introduced or exotic species can adversely affect the ecosystem. An endangered species is a species which has been categorised as very likely to become extinct in the near future.
Question 29 1.2 / -0
Which of the following statements is true if the object is falling from a height?
Solution
The sum of potential energy and kinetic energy is the total mechanical energy of the object falling from a height. During the free fall of the object, the potential energy starts decreasing and converting into kinetic energy with decrease of height from the ground. Hence, total mechanical energy remains same.
Question 30 1.2 / -0
Which of the following Petri dishes is most likely to contain a Lactobacillus colony?
Solution
Lactobacillus is a genus of rod shaped bacteria. Only colony C contains rod shaped bacteria.
Question 31 1.2 / -0
Some water is kept in a beaker. The beaker is kept in a freezer. The water starts freezing. What will happen to the level of water?
Solution
The water changes to ice. Ice has more density as compared to water, so it will float, and extra volume will float above the surface of water. Hence, the level of water will remain unaffected.
Question 32 1.2 / -0
Small liquid drops are spherical in shape due to the phenomenon of
Solution
Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible. So, small liquid drops are spherical in shape.
Question 33 1.2 / -0
When the same note is played on a sitar and a flute, the sound produced can be distinguish from each other because of the difference in which of the following?
Solution
The sound produced by a sitar and a flute can be distinguished from each other when the same note is played on both of them because they are constructed of different materials (wood/brass) and use different mediums to create sound (strings/air). A sitar string vibrates to create sound, whereas air is blown into flute to produce sound.
Question 34 1.2 / -0
Refer to the venn diagram above and choose the correct purpose of ABC.
Solution
A, that is earthworms improve the water holding capacity of the soil. B, that is plough is used to scrape the soil. C, that is hoe is used to remove weeds. They all perform tilling or upturning of the soil and prepare it for cultivation.
Question 35 1.2 / -0
Rahul's voice is twice louder as compared to Simran's voice. What is the relation between intensities of Rahul's and Simran's voice? Ir = Intensity of Rahul's voice Is = Intensity of Simran's voice
Solution
Loudness is directly proportional to the square of intensity.
Hence, option 4 is correct.
Question 36 1.2 / -0
Shilpi is a drummer. She notices that when she plays a drum, it vibrates and produces sound. She wonders if any part of her body also vibrates when she speaks. What could be that part of the body?
Solution
When a human body speaks, the voice box present in the neck of the body has a part called larynx which contains a vocal cord that starts vibrating when our body speaks or while talking to somebody.
Question 37 1.2 / -0
Consider the following statements about the combustion of substances: (i) It is possible to boil water in a paper cup. (ii) L.P.G. undergoes spontaneous combustion. (iii) Paraffin wax burns with a flame. (iv) Yellow orange colour of the flame indicates complete combustion. Which of the above statements are not correct?
Solution
It is possible to boil water in a paper cup because paper does not acquire its ignition temperature until all the water has vaporised. Hence, statement (i) is correct. L.P.G. undergoes rapid combustion, not spontaneous combustion. Hence, statement (ii) is incorrect. Paraffin wax vaporises on heating and burns with a flame. Hence, statement (iii) is correct. When a fuel undergoes partial combustion, the flame formed is yellow and luminous. The flame formed due to complete combustion is blue in colour. Hence, statement (iv) is incorrect.
Question 38 1.2 / -0
Observe the image given below depicting the process of electrolysis of water.
Select the correct option regarding the electrodes X and Y and the gases A and B formed as the products of electrolysis of water.
Solution
When electric current is passed through water, water dissociates into hydrogen and oxygen.
Hydrogen gas is evolved at the cathode (negative electrode) and oxygen gas is evolved at the anode (positive electrode).
Therefore, electrode X is the cathode and gas A is hydrogen gas. Electrode Y is the anode and gas B is oxygen gas.
Question 39 1.2 / -0
Which of the following precautions can be taken when an earthquake occurs?
Solution
Ducking under a table or desk is the quickest way to protect yourself. If you are in a high rise building, and away from a table or desk, move against a wall. Ducking under a table or desk is one of the preventive measures which can be taken at the time of an earthquake.
Question 40 1.2 / -0
Take a ball pen refill and rub it against a woollen cloth. Bring this refill near bits of paper. What can be observed by performing the this activity?
Solution
A charged object attracts an uncharged object: Take a ball pen refill and rub it against a woollen cloth. Bring this refill near bits of paper. It is observed that the refill attracts the bits of paper. This activity shows that a charged object attracts an uncharged object.
Question 41 1.2 / -0
Which of the following phases of Moon appears as a circle with some portion cut off?
Solution
Within about 10 days from the New Moon day; the Moon appears as a circle with some portion cut off. This is called the Waxing Gibbous Moon.
Question 42 1.2 / -0
The distance between the Earth and the Sun is known as:
Solution
The distance between the Sun and the Earth is called one astronomical unit (AU). This unit of distance makes it easy to express the distance of different planets from the Sun.
Question 43 1.2 / -0
Mercury, Venus , Mars and Earth are the terrestrial planet why the planets near to sun are terrestrial planets unlike the planets away from the sun
Solution
The planets near to sun faces more intense solar wind so their gasses part vanish away and only solid part remain there, so they are called terrestrial planet.
Question 44 1.2 / -0
Observe the table given below depicting the uses of some of the products separated out during the fractional distillation of petroleum.
Select, from among the following options, the one that identifies 'W', 'X', 'Y' and 'Z' correctly.
W X Y Z A Bitumen L.P.G. Petrol Kerosene B Bitumen Kerosene Petrol L.P.G. C L.P.G. Petrol Bitumen Kerosene D Bitumen L.P.G. Kerosene Petrol
Solution
Bitumen is a thick, dark liquid obtained as residue during the fractional distillation of petroleum. It is used in paints and for road surfacing. Liquefied petroleum gas (L.P.G.) is a fuel for home and industry. Petrol is used as an automobile fuel, aviation fuel and as a solvent for dry cleaning. Kerosene is used as a fuel for stoves, lamps and for jet aircraft. Hence, option (1) is correct.
Question 45 1.2 / -0
Which of the following is/are a cause of water pollution?
Solution
Discharge of untreated sewage and effluents by factories and industrial units into the nearest water body is the chief cause of water pollution. Most of the rivers and ponds in India are highly polluted because of this. Hence, option (4) is correct. Exhaust from automobiles causes air pollution and chlorofluorocarbons and suspended particulate matter are common air pollutants.
Question 46 1.2 / -0
Copper objects acquire a dull green coating on exposure to moist air.
The chemical reaction that occurs can be represented as:
W, X, Y and Z respectively are:
Solution
The green substance that deposits on copper vessels on exposure to moist air is basic copper carbonate {Cu(OH)
2 .CuCO
3 }.
The reaction that occurs is:
Hence, option (3) is correct.
W is oxygen (O
2 ).
X is water (H
2 O).
Y is carbon dioxide (CO
2 ).
Z is copper hydroxide [Cu(OH)
2 ].
Question 47 1.2 / -0
Which of the following pictures come under the category of fungi?
Question 48 1.2 / -0
The figure given below shows a typical plant cell with its parts labelled 'a-d'. Select the incorrect option regarding the labelled parts.
Solution
The correct labelling is shown below:
In animal cells, the vacuoles are small in size. They are also more in number as compared to a large central vacuole in plants.
Question 49 1.2 / -0
Match the metals from the first column I with the salt solution from the second column with which they will exhibit the displacement reaction.
Metal Salt solutions (i) Copper P. Copper Sulphate (CuSO4 ) (ii) Iron Q. Ferrous sulphate (FeSO4 ) (iii) Zinc R. Zinc sulphate (ZnSO4 ) (iv) Aluminium S. Silver nitrate (AgNO3 )
Solution
In displacement reactions, a more reactive element displaces a less reactive element from a solution of its compounds.
The metals in the decreasing order of their reactivity are listed in the activity series as shown below:
K > Na > Ca > Mg > Al > Zn > Fe > Sn > Pb > Cu > Hg > Ag > Au > Pt
Option (1) displays the correct match:
Question 50 1.2 / -0
Match the following:
A B 1. Drag w. The friction that exists between a stationary object and the surface on which it is resting 2. Rolling friction x. The frictional force exerted by fluids 3. Static friction y. The resistance created by any two objects when sliding against each other 4. Sliding friction z. The force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface
Solution
Drag - The frictional force exerted by fluids Rolling friction - The force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface Static friction - The friction that exists between a stationary object and the surface on which it is resting Sliding friction - The resistance created by any two objects when sliding against each other