Question 1 1.2 / -0
Directions:
Solution
The given codes are according to the number of letters. The word 'football' has 8 letters and 'hockey' has 6 letters. In the same manner, 'badminton' will have 9 as its code.
Question 2 1.2 / -0
Directions:
Solution
Two alternate series are going as follows:
Question 3 1.2 / -0
Directions:
Solution
(Option 2) Amit was his father.
Question 4 1.2 / -0
Directions:
Solution
As Justice and Parul are real brothers and their father is Solace whose brother is Moe, Moe is the uncle of Justice and Parul.
Question 5 1.2 / -0
Directions:
Solution
(3)3 - 1 = 263 - 1 = 633 - 1 = 5113 - 1 = 728
Question 6 1.2 / -0
Directions:
Solution
H is next to the left of K.
Question 7 1.2 / -0
Directions:
Solution
M is sitting to the immediate left of G.
Question 8 1.2 / -0
Directions: In the question below is given a figure followed by four alternatives. Choose the correct mirror image of the given figure.
Question 9 1.2 / -0
Directions: The second figure of the problem figures bears a certain relationship to the first figure. Similarly, one of the figures in the answer figures bears the same relationship to the third figure. You have to select the figure from the set of answer figures which would replace the sign of question mark (?).
Solution
From problem figure (2) to (1), the symbols change their positions as shown in the diagram:
The upper left element and the lower left element rotate 180
o clockwise.
The upper right element and the lower right element rotate 90
o clockwise.
Question 10 1.2 / -0
Which number should come next in the given series?
Solution
25 × 25 = 625 - 25 = 600
Question 11 1.2 / -0
A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointed in the same direction. Then,
Solution
When the charge particle is moving parallel to the magnetic field, force exerted by the magnetic field on it will be zero. The force exerted by the electric field on the electron will be opposite to the direction of the electric field.
Question 12 1.2 / -0
What length of the copper wire of cross sectional area 0.01 mm2 and resistivity 1.7 × 10-8 Ωm will be required to make a resistance of 1.7 kΩ?
Solution
The resistance of the wire is given by:
Hence,
Question 13 1.2 / -0
An elongated object is placed in front of a concave mirror between its pole and focus. As the object moves towards the pole,
Solution
From the figure we can conclude that the image formed is erect and virtual. As the object moves from O to O', the image approaches the mirror from I to I'.
Size of the image becomes less and the distance travelled by the image is more than the distance travelled by the object in the same time, so the speed of the image is more than the speed of the object.
Question 14 1.2 / -0
A metallic wire is connected in series with a DC battery source of +12 V. If the radius and length of the wire are doubled, what effect will it have on the resistance of the wire and current through the wire?
Solution
The resistance of a wire is given by:
is the length of the wire and A is the area of cross section of the wire.
When the radius and length are doubled, then the new resistance of the wire will be
Therefore, the resistance will be reduced to half and V = IR.
The battery voltage will remain the same.
Thus, the current will be doubled.
Question 15 1.2 / -0
A lens is used as a simple magnifier having magnification 5. Find the focal length of the lens.
Solution
A convex lens can be used as a simple magnifier if the object is placed between focal and optical centre.
Magnification of the magnifier,
; where D is the least distance of distinct vision.
Question 16 1.2 / -0
Consider the following diagram:
In the given diagram, why does the coin placed at the bottom of the beaker containing water appear to be raised. Choose the correct reason from the following options.
Solution
It is due to refraction of the light. Refraction is the phenomenon in which there is a change in the path of the light with change in the medium.
Question 17 1.2 / -0
It is not advised to store curd and other sour substances in copper or brass vessels because
Solution
All sour substances like curds and pickles contain acids, and acids react with metals.
Question 18 1.2 / -0
The following apparatus was set up to carry out a reaction between zinc granules and sulphuric acid. The gas formed as one of the products was trapped in the soap bubbles, which exploded with a pop sound when a burning candle was brought near. Identify the gas.
Solution
Metals more reactive than hydrogen can displace it from the acids.2 SO4 , hydrogen gas is evolved and on passing it through a soap solution it gets trapped in soap bubbles. On bringing a burning candle near the bubbles, the hydrogen gas burns with a pop sound. 2 SO4 + Zn → ZnSO4 + H2 ↑
Question 19 1.2 / -0
The reaction of NaCl with H
2 SO
4 yields HCl gas, which has no effect on the litmus paper.
This is because
Solution
Substances do not ionise in their gaseous state.+ ions only in its aqueous solution.
Question 20 1.2 / -0
The electron dot structure of CO
2 is as follows:
How many electrons are shared between the carbon atom and each of the oxygen atoms?
Solution
The given electron dot structure represents the molecule of CO2 and it clearly shows that the carbon atom forms a double bond with each of the oxygen atoms, sharing 4 electrons.
Question 21 1.2 / -0
Observe the given electron dot structure of sulphur and comment on the atomicity and the shape of the molecule:
Solution
The atomicity of sulphur is 8 (S8 ).
Question 22 1.2 / -0
Which of the following statements is/are the correct reason(s) for rubbing a magnesium ribbon with sand paper before burning it in air?
Solution
Magnesium is a reactive metal and it reacts with the atmospheric oxygen to form a layer of magnesium oxide on its surface. 2 and water vapour in the air to form a layer of basic magnesium [MgCO3 .Mg(OH)2 ].
Question 23 1.2 / -0
Consider the balanced equation of the reaction between the aqueous solutions of barium chloride and sodium sulphate:
BaCl
2 + Na
2 SO
4 BaSO
4 + 2NaCl
Which of the following species can be separated from the mixture as a solid precipitate?
Solution
This is a double replacement reaction in which an exchange of ions takes place between the reactant species.
BaCl
2 (aq) + Na
2 SO
4 (aq)
BaSO
4 (s) + 2NaCl(aq)
The BaSO
4 formed is an insoluble salt and appears as a white ppt.
Question 24 1.2 / -0
Why does a solution of copper sulphate change its colour when an iron nail is dipped into it?
Solution
When an iron nail is dipped in the copper sulphate solution, the iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore, the colour of the solution changes from the blue of copper sulphate to the green of ferrous sulphate.
Fe(s) + CuSO
4 (aq)
FeSO
4 (aq) + Cu(s)
Question 25 1.2 / -0
What is the most significant limitation of Dobereiner's classification of elements?
Solution
The main limitation of the Dobereiner's classification was that all the known elements could not be classified into triads on the basis of their properties.
Question 26 1.2 / -0
_______ and ________ are the two elements that show chemical reactions similar to those shown by magnesium.
Solution
(Option 2) Calcium (Ca) and strontium (Sr) are expected to show chemical reactions similar to those shown by magnesium (Mg). This is because the number of valence electrons (2) is same in all these three elements and that chemical properties depend on the valency, which further depends on the number of valence electrons.
These elements belong to group 2 of the periodic table.
Group 2 Be Mg Ca Sr Ba Ra
Question 27 1.2 / -0
The position of an element in the periodic table is related to its electronic configuration. In this context, identify the correct statement among the following.
Solution
In the modern periodic table, atoms with similar electronic configuration are placed in the same vertical column or group and they exhibit similarity in their chemical properties. Hence, option (2) is correct.
Question 28 1.2 / -0
How many moles of iron will react with excess of water to produce four moles of hydrogen gas?2 O → Fe3 O4 + 4H2
Solution
A balanced equation should have equal number of atoms of each element on each side of the equation.2 O to produce 1 mole of Fe3 O4 and 4 moles of H2 .
Question 29 1.2 / -0
Look at the following reaction equations and choose which one shows double displacement?2 (aq) → 2KI (aq) + BaBr2 (aq) 2 (aq) → 2KF (aq) + Br2 (aq)
Solution
A double displacement reaction is the one in which an exchange of ions takes place between the reactant species.2 (aq) → 2KI (aq) + BaBr2 (aq)
Question 30 1.2 / -0
I.
II.
III.
Which of these molecules will have the lowest boiling point?
Solution
Among the isomers, branched isomers have the lowest boiling point as they have a lesser surface area.
Question 31 1.2 / -0
In the reaction of zinc granules with sulphuric acid, how many moles of hydrogen gas are produced per mole of the acid.
Solution
It is evident from the balanced equation that 1 mole of hydrogen gas is produced from each mole of zinc metal.
Question 32 1.2 / -0
Gibberellins were discovered by a Japanese botanist while studying the "foolish seedling" disease in rice. They were first isolated from the fungus known as
Solution
Gibberellins were discovered in 1926 by a Japanese scientist, Eiichi Kurosawa, studying bakanae, the "foolish seedling" disease in rice. It was first isolated in 1935 by Teijiro Yabuta and Sumuki, from fungal strain (Gibberella fujikuroi ) provided by Kurosawa.
Question 33 1.2 / -0
What kind of epithelium is found in our respiratory system?
Solution
Ciliated epithelial tissue is found in our respiratory tract and in the Fallopian tubes of women. Ciliated epithelium contains goblet cells, which secrete mucous. This mucous, combined with the cilia on the tissue, helps move harmful particles out of our bodies to keep us healthy.
Question 34 1.2 / -0
It is a biological fact that human stomach produces acid. Which of the following is not a role of hydrochloric acid produced by the stomach?
Solution
The primary role of hydrochloric acid is to sterilise the food you eat and to prevent harmful bacteria from entering the GI tract. HCl also triggers the release of enzymes such as pepsin, which are essential for the digestion of protein.
Question 35 1.2 / -0
Villi are adapted for the maximum absorption of digested food molecules. Which property makes them suitable for the same?
Solution
Villi are adapted for the maximum absorption of digested food molecules. This is because the folded villi greatly increase the surface area of the intestine; the villi are made of a single layer of thin cells; beneath the villi is an extensive blood capillary network to distribute the absorbed food molecules.
Question 36 1.2 / -0
Site of transfer of oxygen and other nutrients from the bloodstream to other tissues in the body is
Solution
Capillaries are the smallest of the body's blood vessels. They are only one cell thick, and they are the site of the transfer of oxygen and other nutrients from the bloodstream to other tissues in the body. They also collect carbon dioxide waste materials and fluids for return to the veins.
Question 37 1.2 / -0
It is practically impossible to kill a sponge. This is due to the process of
Solution
All sponges possess a remarkable ability to regenerate lost parts. A piece cut from the body of a sponge is capable of growing into a complete sponge. Due to this, it is impossible to kill a sponge.
Question 38 1.2 / -0
"These are very beneficial for an organism while reproducing. These are distributed easily by air to far-off places to avoid competition at one place. Large numbers are produced in a single sporangium and they are also covered with thick walls to avoid dehydration."
Solution
A spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. The description given is of fungal spores.
Question 39 1.2 / -0
Study the food chain given below.
What percentage of energy is transferred from sun to grass?
Solution
Only 1% of the sun's energy is captured by plants. When organisms are consumed, 10% of the energy in the food is fixed into their flesh and is available for next trophic level (carnivores or omnivores).
Question 40 1.2 / -0
Consider the statements given below regarding biomagnification and choose the correct option that follows.Statement I: Biomagnification is the increasing concentration of a substance, such as a toxic chemical in the tissues of an organism.Statement II: Bioaccumulation occurs within a trophic level whereas biomagnification occurs across trophic (food chain) levels.
Solution
Both the statements are true. Biomagnification is the increasing concentration of a substance, such as a toxic chemical, in the tissues of organisms at successive higher levels in a food chain. Bioaccumulation occurs within a trophic level whereas biomagnification occurs across trophic (food chain) levels.
Question 41 1.2 / -0
A highly polluted city will not show the growth of
Solution
The hardy lichens are useful bio-indicators for air pollution, especially sulphur dioxide pollution, since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil.
Question 42 1.2 / -0
The presence of which of the following metals causes the teeth of the children to discolour?
Solution
Excess fluoride in water leads to yellowing of teeth. It causes a condition known as dental fluorosis.
Question 43 1.2 / -0
The structure that prevents the acidic contents of the stomach from moving upward into the esophagus is
Solution
The cardiac sphincter, at the upper portion (cardia) of the stomach, prevents the acidic contents of the stomach from moving upward into the esophagus.
Question 44 1.2 / -0
The primary form of sugar transported from the site of photosynthesis to the rest of the plant is
Solution
The primary form of sugar transported from the site of photosynthesis to the rest of the plant is sucrose. Starch is the storage form of carbohydrates.
Question 45 1.2 / -0
The pathway which is common to both aerobic and anaerobic pathways of respiration is
Solution
Glucose is broken down by the process of glycolysis. This is the common pathway for both aerobic and anaerobic conditions. Under aerobic conditions, pyruvate formed enters the Kreb's cycle. Under anaerobic conditions, pyruvate is converted into lactate in muscles.
Question 46 1.2 / -0
Kiera was working on a Science experiment in lab. She cleaned the magnesium ribbon about 2 cm long by rubbing it with sandpaper. She held it with a pair of tongs, burned it using a spirit lamp or burner and collected the ash so formed in a watch-glass.
Solution
When we burn the magnesium ribbon, we will observe that the ash so formed after burning it will be the magnesium oxide.
Question 47 1.2 / -0
Heat dissipated by a wire having length L and area A connected to the source of voltage V in time t is H. When the same wire is stretched to double its length and is again connected to the same source, then the heat dissipated in it in the same time interval is
Solution
Heat dissipated in the wire having resistance R is
-----1
The resistance of the wire is
------2
where 'v' is the volume of the wire which remains constant when the wire is stretched.
From 1 and 2, we have
When the wire is stretched to double its length, then heat produced is H'
or
Question 48 1.2 / -0
Match the below mentioned parts of human heart in column I with their appropriate functions in column II.
Column I Column II (a) Septum (i) Carry the deoxygenated blood to right atrium of the heart (b) Pulmonary artery (ii) Receives blood from lungs (c) Inferior vena cava (iii) Maintains rigidity and support to the heart (d) Left auricle (iv) Transports oxygen-depleted blood to lungs
Solution
Septum is responsible for maintaining rigidity and support to the heart and it helps in proper functioning of the heart.
Question 49 1.2 / -0
Urea, the principal nitrogenous excretory compound in humans, is synthesised
Solution
Urea is the principal nitrogenous compound which is excreted by the humans. It is synthesised in the liver by urea cycle but excreted via kidneys.
Question 50 1.2 / -0
According to the given image above, which of the following is/are precaution(s) that is/are true to be considered in order to determine the focal length of a concave mirror by obtaining the image of a distant object?
(i) The base of the concave mirror stand and the screen should not be parallel to the metre scale.
(ii) The concave mirror should be fixed in the vertical plane.
(iii) Place the screen behind the mirror.
Solution
To determine the focal length of a concave mirror by obtaining the image of distant object, place the screen in front of the mirror and the concave mirror should be fixed in the vertical plane.
×
Sign in
Profile
Signout
Get latest Exam Updates 
