Question 1 1.2 / -0
In the following problem, if mirror is placed on line MN, then which of the answer figures will be the correct image of the given figure?
Solution
The image gets flipped horizontally when a mirror is placed on line MN.
Question 2 1.2 / -0
Directions: Choose the alternative which resembles closely to the water image of the given figure.
Solution
The question figure will be flipped vertically as we need to find its water image.
Question 3 1.2 / -0
Directions: A piece of paper is folded and cut as shown below in the question figures. From the given answer figures, indicate how it will appear when opened.
Solution
In this way we will open the given piece of paper and the final image will be the given option.
Question 4 1.2 / -0
Which of the following answer figures will complete the pattern in the question figure?
Question 5 1.2 / -0
From the given answer figures, select the one in which the question figure is embedded.
Solution
The question figure is embedded in this option and is shown with red colour.
Question 6 1.2 / -0
What number will come next in the given series?
Solution
Each time the gap between the numbers is decreasing by 3.
Question 7 1.2 / -0
If SCRIBBLE is coded as 09-11-17-23-06-06-18-24, then how will LIBBERS be coded in that language?
Solution
According to the question,
Question 8 1.2 / -0
Looking at a girl, Meera said, "She is the daughter of my grandfather's wife's only child." How is the girl related to Meera?
Solution
Grandfather's wife -> Meera's grandmother
Question 9 1.2 / -0
Select the missing number from the given responses.
Solution
For first box:
=
= 50
For second box:
=
= 98
For third box:
=
= 162
Question 10 1.2 / -0
A girl was walking towards south and covered a distance of 7 m. She took a left turn and covered a distance of 10 m. Finally, she turned right and covered another 2 m. In which direction is she now from the starting point?
Solution
She is in the south-east direction from the starting point.
Question 11 1.2 / -0
Two mirrors are inclined at an angle θ. Light ray is incident parallel to one of the mirrors. The ray will start retracing its path after third reflection if θ is equal to
Solution
The light ray will retrace its path is it strikes the second mirror normally.
In triangle ABC, ∠C = 90°, ∠B = θ
Hence, we have θ + 90° + θ = 180°
So, θ = 45°
Question 12 1.2 / -0
If a wire is stretched uniformly to increase its length by 10%, then the percentage change in resistance is
Solution
The resistance of the wire is given by:
During stretching of the wire, the volume remains the same.
So,
Hence, the resistance of the wire can be written as:
Let the new length of the wire be
Hence, the resistance of the stretched wire is
Percentage change in the resistance of the wire is
%
Question 13 1.2 / -0
The essential difference between an AC generator and a DC generator is that
Solution
The only difference between an AC generator and a DC generator is that a split-ring commutator is used in DC generator, whereas two slip rings are used in AC generator.
Question 14 1.2 / -0
The following is given a chart that shows the image formation of
by a concave mirror for different positions of the object. Fill in the missing terms to complete the table.
Solution
The correct table is as follows:
(I) When the object is at infinity, the position of the image is at the focus F.
(II) When the object is between C and F, the position of the image is beyond C.
(III) When the position of the object is beyond C, the position of the image is between F and C and the size of the image is diminished.
(IV) When the object is at F, the position of the image is at infinity and the size is highly enlarged.
Question 15 1.2 / -0
How much work is done in moving a charge of He2 + ions from a point at 118 volts to a point at 128 volts?
Solution
We know, potential difference, V =
Here, potential difference, V = 128 – 118 = 10 volts
Work done, W = ?
Charge on the He
2+ ion = 2 × 1.6 × 10
-19 = 3.2 × 10
-19 C
Hence, work done, W = VQ = 10 × 3.2 × 10
-19 = 32 × 10
-19 J
Question 16 1.2 / -0
A conducting wire shown in the figure carries current I. Segments AB and CD are of the same length. The direction of the magnetic field at point P is
Solution
We can find the direction of the magnetic field by using the right thumb hand rule which states that if the thumb gives the direction of the current, then the direction of the magnetic field lines can be determined by the curling of the fingers.
Question 17 1.2 / -0
Safe current of a fuse wire depends upon
Solution
Safe current through the fuse wire is independent of the length of the wire. It depends upon the radius of the fuse wire as
.
Question 18 1.2 / -0
A wire of the resistance 8Ω is cut in the ratio 3 : 1 and then two wires are connected across the 12 V battery. Then, the power developed across the larger length of the wire is
Solution
As the resistance of the wire is directly proportional to the length of the wire, the resistance of the larger length is 6Ω and the resistance of the smaller length is 2Ω.
Power dissipated in 6Ω resistance,
P = 24 W
Question 19 1.2 / -0
Which of the following molecules has the strongest carbon-to-carbon bond?
Solution
Order of bond strength of carbon-carbon bonds:
C
2 H
2 is ethyne and has the structure
.
Hence, the carbon-carbon bond is the strongest in ethyne.
Question 20 1.2 / -0
Which of the following is NOT observed when calcium metal is dropped in water at room temperature?
Solution
Metals + H
2 O(l)
Metal hydroxide + H
2 Metals + H
2 O(g)
Metal oxide + H
2 Since calcium metal can react with water, it will yield a hydroxide.
All the other observations are correct.
Question 21 1.2 / -0
The correct order of atomic radii for the given elements is:
Solution
C, N and O are elements of the second period.
Question 22 1.2 / -0
Freshly whitewashed walls develop a bright sheen on drying, which is due to the deposition of a substance that is similar in composition to
Solution
Limewater is a saturated solution of calcium hydroxide which is used as a whitewash.
Atmospheric CO
2 reacts with limewater to form calcium carbonate, which gives it a brilliant sheen.
Question 23 1.2 / -0
Which of the following is an organic acid?
Solution
Organic acids are carboxylic acids, having an carboxyl group –COOH.
Question 24 1.2 / -0
What are the end products formed when sulphuric acid reacts with sodium carbonate?
Solution
Sulphuric acid gives sodium sulphate, carbon dioxide gas and water when it reacts with sodium carbonate.
Question 25 1.2 / -0
Which of the following statements is NOT correct about the trends when going from left to right across the periods of the periodic table?
Solution
On moving from left to right across the periods of the periodic table, the atomic radius decreases and hence the ionisation energy increases.
Question 26 1.2 / -0
Which of the following is an example of a hazardous waste?
Solution
Hazardous waste is waste that poses a substantial and potential threat to public health or the environment. In the United States, the treatment, storage, and disposal of hazardous waste are regulated under the Resource Conservation and Recovery Act (RCRA). The most common examples of hazardous waste found within the homes include paints, batteries, solvents, cleaning agents and pesticides.
Question 27 1.2 / -0
In which of the following parts of the plants is apical meristem found?
Solution
Apical meristem is present on root apex, stem apex, leaf buds and flower buds. They are responsible for growth in length, i.e. primary growth.
Question 28 1.2 / -0
Junction between two neurons is called
Solution
Synapse is the junction between two neurons. In the nervous system, a synapse is a structure that permits a neuron (or nerve cell) to pass an electrical or chemical signal to another neuron.
Question 29 1.2 / -0
Which of the following is the chromosomal attachment of the spindle microtube?
Solution
Centromere is the region of a chromosome to which the microtubules of the spindle attach, via the kinetochore, during cell division. During prophase, the spindle also begins to form as the two pairs of centrioles move to opposite poles and microtubules begin to polymerise from the duplicated centrosome.
Question 30 1.2 / -0
The three pairs of salivary glands that secrete into the oral cavity are
Solution
The salivary glands in mammals are exocrine glands, glands with ducts, that produce saliva. The 3 types of salivary glands are parotid, submandibular and sublingual glands.
Question 31 1.2 / -0
Which among the following is described in the given statement?
Solution
The process in which the absorbed food is taken in by the body cells and used for energy, growth and repair is called assimilation.
Question 32 1.2 / -0
Which among the following processes is being defined in this statement?
Solution
In this process, an organism divides into two equal parts, which on separation live independently. During this process, the nucleus of the parent cell divides mitotically into two equal parts; which is followed by the division of the cytoplasm resulting in the formation of the two identical cells referred to as daughter cells.
Question 33 1.2 / -0
What is the respiratory organ of mosquito?
Solution
Tracheoles are the thin tubes attached to the trachea within the body of an insect and permit gaseous exchange.
Question 34 1.2 / -0
Which among these reproduces by the method of fragmentation?
Solution
Reproduction by fragmentation is seen in filamentous algae, e.g. spirogyra. The filament of spirogyra divides into many pieces and each piece develops into a new individual.
Question 35 1.2 / -0
Which of the following is not a bisexual flower?
Solution
A flower that contains both the male and the female reproductive structure (stamen and pistil) is called a bisexual flower. Unisexual flowers are those flowers which have either the stamen or the pistil. Examples of plants that bear unisexual flowers are corn, papaya, cucumber, etc.
Question 36 1.2 / -0
Male hormone testosterone is produced by
Solution
Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle. They produce testosterone in the presence of luteinizing hormone (LH).
Question 37 1.2 / -0
Which among the following are being described in the given statement?
Solution
The microscopic aquatic plants freely floating on the surface of water are called phytoplankton. Phytoplankton have chlorophyll to capture sunlight, and they use photosynthesis to turn it into chemical energy. They consume carbon dioxide, and release oxygen.
Question 38 1.2 / -0
Rohit has planted a new herb in his garden. He wants to propagate the plant on a large scale. Though the plant roots easily, the propagation process can often be hastened by treating cuttings with commercially available rooting hormones. Which of the following hormones will Rohit buy from the market for this purpose?
Solution
Naphthaleneacetic acid (NAA) is a synthetic plant hormone in the auxin family and is an ingredient in many commercial plant rooting horticultural products. It is a rooting agent.
Question 39 1.2 / -0
The process that reduces the ploidy (number of chromosomes) of the gametes from diploid to haploid is
Solution
The primary function of meiosis is the reduction of the ploidy (number of chromosomes) of the gametes from diploid (2n, or two sets of 23 chromosomes) to haploid (1n or one set of 23 chromosomes). This ensures that on fertilisation, the diploid number is retained in the offspring.
Question 40 1.2 / -0
The mode of transmission of Vibrio cholerae is:
Solution
Vibrio cholerae is the causative agent responsible for cholera. The bacteria are transmitted between humans through the faecal-oral route; a bite of contaminated food or a sip of contaminated water can cause infection.
Question 41 1.2 / -0
Rohan was bitten by a malaria-infected mosquito that led to the release of malarial parasites into his blood. The main target organ where these parasites reproduce will be:
Solution
When bitten by a malaria-infected mosquito, the parasites that cause malaria are released into our blood and infect our liver cells. The parasite reproduces in the liver cells, which then burst open. This allows thousands of new parasites to enter the bloodstream and infect red blood cells.
Question 42 1.2 / -0
Longitudinal binary fission takes place in:
Solution
Binary fission of Leishmania happens in a longitudinal plane due to the presence of flagella at one end of the cell.
Question 43 1.2 / -0
Most of the flowers in your garden have large bright-coloured petals. Also, these contain large amount of nectar and are sweet scented. These flowers will be pollinated by
Solution
Insect-pollinated flowers are large and have bright-coloured petals to attract insects. Also, they are sweet scented and contain large amount of nectar. All these factors help to attract insects.
Question 44 1.2 / -0
Pollination by bats is known as:
Solution
Chiropterophily is pollination of plants by bats. Bat pollination is most common in tropical and desert areas that have many night-blooming plants.
Question 45 1.2 / -0
Snigdha's grandmother suffered from a leg fracture. The doctor told her that her grandmother had a very low calcium level. Along with that she also had vitamin deficiency that helps in absorption of calcium in the body. The vitamin is:
Solution
Mineral deposition in bones and teeth is due to vitamin D. Vitamin D refers to a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate. Vitamin D helps in absorption of minerals present in milk and other food items.
Question 46 1.2 / -0
A, B, C and D are the samples of solutions with pH values of 14, 0, 7 and 4, respectively. Which of the following could be the probable identification of the sample solutions provided?
Solution
A NaOH (aq) Strong base B HCl (aq) Strong acid C NaCl (aq) Neutral salt D CH3 COOH (aq) Weak acid
Question 47 1.2 / -0
Which of the following reactions could be categorised as a neutralisation reaction?
Solution
Ca(OH)
2 (I) + CO
2 (g)
CaCO
3 (s) + H
2 O(I)
Oxides of non metals are acidic; hence this is a neutralisation reaction between a base and an acidic oxide to give salt and water.
Question 48 1.2 / -0
The following are the different modes of reproduction. Match the correct mode with the diagram.
s
Solution
(a) represents
Single-celled organisms, such as Plasmodium, divide into many daughter cells simultaneously by multiple fission.
(b) represents
In Hydra, a bud develops and outgrowth due to repeated cell division at one specific site.
(c) represents
In many simple multi-cellular organisms, specific reproductive parts can be identified.
(d) represents
Simple animals like Planaria can be cut into any number of pieces and each piece grows into a complete organism.
Question 49 1.2 / -0
The following is the diagram of Human Heart followed by different characteristics of parts of Human Heart. Select the option which represents the respective characteristics of parts B, D and F of the given figure.
Characteristics:
1. This ensures that blood does not flow backwards when atria contract.
2. De-oxygenated blood comes from the body to this chamber.
3. When it contracts in its turn, the blood is pumped out to the body.
4. Oxygen rich blood comes to this part of the heart.
5. As they have to pump blood into various organs, they have thicker muscular walls.
6. It pumps the blood to the lungs for oxygenation.
Solution
B is Right Atrium. De-oxygenated blood comes from the body to the upper chamber on the right, the right atrium.
D is Left Ventricle. When muscular left ventricle contracts in its turn, the blood is pumped out to the body.
F is Right Ventricle. When right atrium contracts, the corresponding lower chamber, the right ventricle, dilates. This transfers the blood to the right ventricle, which in turn pumps it to the lungs for oxygenation.
Question 50 1.2 / -0
A rod is placed before a concave mirror having radius of curvature 20 cm as shown in the figure below. Find the total length of the image.
Solution
Considering the image of the point A,
u = -40 cm, f = -10 cm
Using mirror formula:
Considering the image of the point B,
u = -30 cm
Length of the image = v
B - v
A = 15 - 13.3 = 1.7 cm
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