Chemistry · NDA previous year questions

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2014 11 questions

Q532014 · 28 Sept 2014
Which one of the following circuit elements is an active component?
1. A.Resistor
2. B.Transistor
3. C.Inductor
4. D.Capacitor
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Answer: B
Q672014 · 28 Sept 2014
The working of a microwave oven involves
1. A.absorption of microwaves by matter
2. B.reception of microwaves by optical fibre
3. C.microwave amplification by stimulated emission of radiation
4. D.transmission of microwaves through a metal
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Answer: A
Q752014 · 28 Sept 2014
A sample of carbon dioxide that undergoes a transformation from solid to liquid and then to gas would undergo
1. A.a change in mass
2. B.a change in density
3. C.a change in composition
4. D.no change in physical properties
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Answer: B
Q762014 · 28 Sept 2014
Which of the following element combinations will form ionic compounds? 1. Ca $(Z = 20)$ and Ti $(Z = 22)$ 2. Si $(Z = 14)$ and Br $(Z = 35)$ 3. Mg $(Z = 12)$ and Cl $(Z = 17)$ Select the correct answer using the code given below.
1. A.2 only
2. B.3 only
3. C.2 and 3 only
4. D.1, 2 and 3
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Answer: B
Q782014 · 28 Sept 2014
A compound $X_{2} O_{3}$ contains 31.58% oxygen by weight. The atomic mass of X is
1. A. $34.66 g mo l^{- 1}$
2. B. $45.01 g mo l^{- 1}$
3. C. $52.00 g mo l^{- 1}$
4. D. $104.00 g mo l^{- 1}$
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Answer: C
Q812014 · 28 Sept 2014
The burning sensation of a beesting can be stopped by rubbing the affected area with soap. This is because
1. A.a beesting is acidic and soap, an alkali, neutralizes it
2. B.a beesting is alkaline and soap, an acid, neutralizes it
3. C.soap cleans the affected area and removes the sting
4. D.soap acts as an anesthetic and dulls the sensation
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Answer: A
Q842014 · 28 Sept 2014
A sample of gas is to be identified by means of its behaviour in the presence of a glowing splint. Which of the following gases will neither itself burn nor cause the splint to burn?
1. A.Oxygen
2. B.Nitrogen
3. C.Hydrogen
4. D.Methane
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Answer: B
Q862014 · 28 Sept 2014
Consider the following reaction : $x A s_{2} S_{3} + y O_{2} \to z A s_{2} O_{3} + w S O_{2}$ What is $y$ (the coefficient for $O_{2}$ ) when this equation is balanced using whole number coefficients?
1. A.5
2. B.7
3. C.9
4. D.11
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Answer: C
Q882014 · 28 Sept 2014
If the reaction of $1.0 mol N H_{3} (g)$ and $1.0 mol O_{2} (g)$ $4 N H_{3} (g) + 5 O_{2} (g) \to 4 NO (g) + 6 H_{2} O (l)$ is carried to completion, then
1. A.all the $O_{2} (g)$ is consumed
2. B. $4.0 mol NO (g)$ is produced
3. C. $1.5 mol H_{2} O (l)$ is produced
4. D.all the $N H_{3} (g)$ is consumed
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Answer: A
Q892014 · 28 Sept 2014
The very high heat of vaporization of water is mainly a result of
1. A.van der Waals forces
2. B.covalent bonds
3. C.interionic attraction
4. D.hydrogen bonding
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Answer: D
Q902014 · 28 Sept 2014
A monatomic species that has 18 electrons and a net charge of $2^{-}$ has
1. A.the same number of electrons as a neutral argon atom
2. B.more protons than electrons
3. C.2 unpaired electrons
4. D.20 protons
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Answer: A