Chemistry · NDA previous year questions

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2019 27 questions

Q612019 · 17 Nov 2019
If the work done on the system or by the system is zero, which one of the following statements for a gas kept at a certain temperature is correct?
1. A.Change in internal energy of the system is equal to flow of heat in or out of the system.
2. B.Change in internal energy of the system is less than heat transferred.
3. C.Change in internal energy of the system is more than the heat flow.
4. D.Cannot be determined.
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Answer: A
Q762019 · 17 Nov 2019
Let there be an object having some chemicals in it. It starts moving with a uniform velocity v and a chemical reaction starts happening. In this case, which of the following statement/s is/are correct? 1. Chemical reactions happening in the system cannot change the velocity v of the center of mass of the object. 2. Chemical reactions happening in the system cannot change kinetic energy of the particles inside with respect to the center of mass of object. Select the correct answer using the code given below:
1. A.1 only
2. B.2 only
3. C.Both 1 and 2
4. D.Neither 1 nor 2
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Answer: A
Q772019 · 17 Nov 2019
Which one of the following compounds does not exhibit a different oxidation number of the same element?
1. A. $P b_{3} O_{4}$
2. B. $F e_{3} O_{4}$
3. C. $F e_{2} O_{3}$
4. D. $M n_{3} O_{4}$
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Answer: C
Q802019 · 17 Nov 2019
Which one of the following statements about diamond and graphite is not correct?
1. A.Diamond has a tetrahedral structure, whereas graphite has a hexagonal planar structure.
2. B.Both physical and chemical properties of diamond and graphite are different.
3. C.Graphite is soft but diamond is hard.
4. D.Graphite is a good conductor of electricity while diamond is not.
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Answer: B
Q812019 · 17 Nov 2019
The raw materials used for the manufacture of Portland cement are
1. A.Lime, silica and sulphur dioxide
2. B.Lime, silica and carbon dioxide
3. C.Lime, silica and alumina
4. D.Lime, silica and boric acid
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Answer: C
Q822019 · 17 Nov 2019
Which one of the following statements about water is not true?
1. A.Hydrogen bonds are present in liquid water.
2. B.Water has a high boiling point.
3. C.Water has a high heat of fusion.
4. D.Water is a non-polar molecule.
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Answer: D
Q842019 · 17 Nov 2019
Which one of the following does not represent the salt, Calcium carbonate?
1. A.Lime water
2. B.Limestone
3. C.Chalk
4. D.Marble
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Answer: A
Q862019 · 17 Nov 2019
Which one of the following is termed as ‘Dry ice’?
1. A.Ice present in ice-cream
2. B.Solid water at Antarctica
3. C.Solid state of carbon dioxide
4. D.Solid water of ionosphere
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Answer: C
Q882019 · 17 Nov 2019
Which one of the following statements regarding cathode rays is not correct?
1. A.Cathode ray particles are electrons.
2. B.Cathode ray particles start from anode and move towards cathode.
3. C.In the absence of electrical and magnetic fields, cathode rays travel in straight lines.
4. D.Television picture tubes are cathode ray tubes.
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Answer: B
Q892019 · 17 Nov 2019
A very large volume of hydrogen can be accommodated by making
1. A.non-metallic hydrides.
2. B.hydrogen peroxide.
3. C.non-stoichiometric hydrides.
4. D.alkali metal hydrides.
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Answer: C
Q902019 · 17 Nov 2019
Which one of the following is not a monatomic element?
1. A.Copper
2. B.Helium
3. C.Iodine
4. D.Barium
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Answer: C
Q912019 · 17 Nov 2019
Which one of the following represents the correct order of electron releasing tendency of metals?
1. A.Zn > Cu > Ag
2. B.Ag > Cu > Zn
3. C.Cu > Zn > Ag
4. D.Cu > Ag > Zn
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Answer: A
Q962019 · 17 Nov 2019
Which one of the following is the major constituent of biogas?
1. A.Carbon dioxide
2. B.Nitrous oxide
3. C.Methane
4. D.Oxygen
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Answer: C
Q1012019 · 17 Nov 2019
Which one of the following is a non-metallic mineral?
1. A.Iron
2. B.Mica
3. C.Copper
4. D.Bauxite
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Answer: B
Q572019 · 21 Apr 2019
Two metallic wires $A$ and $B$ are made using copper. The radius of wire $A$ is $r$ while its length is $l$ . A dc voltage $V$ is applied across the wire $A$ , causing power dissipation, $P$ . The radius of wire $B$ is $2 r$ and its length is $2 l$ and the same dc voltage $V$ is applied across it causing power dissipation $P_{1}$ . Which one of the following is the correct relationship between $P$ and $P_{1}$ ?
1. A. $P = 2 P_{1}$
2. B. $P = P_{1} /2$
3. C. $P = 4 P_{1}$
4. D. $P = P_{1}$
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Answer: B
Q592019 · 21 Apr 2019
Light year is a unit of measurement of
1. A.very large distances
2. B.time interval in years
3. C.amount of light received on earth in a year
4. D.mass of atoms
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Answer: A
Q702019 · 21 Apr 2019
LIGO stands for
1. A.Laser Interferometer Gravitational wave Observatory
2. B.Light Interferometer Gravitational wave Observatory
3. C.Light Induced Gravity Observatory
4. D.Laser Induced Gaseous Optics
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Answer: A
Q722019 · 21 Apr 2019
Which one of the following energy is stored in the links between the atoms?
1. A.Nuclear energy
2. B.Chemical energy
3. C.Potential energy
4. D.Thermal energy
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Answer: B
Q762019 · 21 Apr 2019
Which one of the following metals does NOT react with cold water?
1. A.Calcium (Ca)
2. B.Potassium (K)
3. C.Magnesium (Mg)
4. D.Sodium (Na)
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Answer: C
Q772019 · 21 Apr 2019
In which of the following pairs are the ions isoelectronic?
1. A. $M g^{2 +}, Ar$
2. B. $N a^{+}, O^{2 -}$
3. C. $A l^{3 +}, C l^{-}$
4. D. $K^{+}, Ne$
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Answer: B
Q782019 · 21 Apr 2019
MCQ (More than One Correct Answer) Which one of the following is used as a binder in paints?
1. A.Titanium dioxide
2. B.Novolac
3. C.Phthalocyanine
4. D.Silicones
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Answer: B, D
Q812019 · 21 Apr 2019
Which one of the following statements is NOT correct for the given reaction ? $Fe (s) + CuS O_{4} (aq) \to FeS O_{4} (aq) + Cu (s)$
1. A.Iron is the reducing agent
2. B.The solution turns green in colour after the reaction
3. C.Copper is a more reactive metal than iron
4. D.The reaction is an example of a redox reaction
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Answer: C
Q832019 · 21 Apr 2019
Dinitrogen ( $N_{2}$ ) and dioxygen ( $O_{2}$ ) are the main constituents of air but they do not react with each other to form oxides of nitrogen because
1. A.the reaction requires initiation by a catalyst
2. B.oxides of nitrogen are unstable
3. C.the reaction is endothermic and requires very high temperature
4. D.the stoichiometry of $N_{2}$ and $O_{2}$ in air is not ideal for the reaction to take place
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Answer: C
Q842019 · 21 Apr 2019
The equivalent weight of oxalic acid in $C_{2} H_{2} O_{4} \cdot 2 H_{2} O$ is
1. A.45
2. B.63
3. C.90
4. D.126
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Answer: B
Q852019 · 21 Apr 2019
On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compounds ?
1. A.Copper carbonate
2. B.Copper oxide
3. C.Copper sulphate
4. D.Copper nitrate
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Answer: A