Chemistry · NDA previous year questions

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2015 14 questions

Q652015 · 27 Sept 2015
In case of a compound microscope which of the following statements is / are correct? 1. The focal length of the eye piece is larger than the focal length of the objective 2. The focal length of the eye piece is smaller than the focal length of the objective 3. The image produced in a normal optical microscope is real 4. The image produced in a normal optical microscope is virtual Select the correct answer using the code given below:
1. A.1 only
2. B.1 and 4
3. C.2 and 3
4. D.2 and 4
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Answer: B
Q732015 · 27 Sept 2015
Which one of the following statements is not correct?
1. A.Conduction can occur easily in solids, less easily in liquids but hardly at all in gases
2. B.Heat energy is carried by moving particles in a convection current
3. C.Heat energy is carried by electromagnetic waves in radiation
4. D.The temperature at which a solid changes into a liquid is called the boiling point
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Answer: D
Q752015 · 27 Sept 2015
The symbol of the element ‘Tungsten’ is:
1. A.Ta
2. B.W
3. C.Tl
4. D.Tc
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Answer: B
Q762015 · 27 Sept 2015
Which one of the following statements is correct?
1. A.Rutherford’s alpha-particle scattering experiment led to the discovery of electron
2. B.J J Thomson suggested that the nucleus of an atom contains protons
3. C.The atomic number of an element is the same as the number of protons in the nucleus of its atom
4. D.The mass number of an atom is equal to the number of electrons in its shells
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Answer: C
Q772015 · 27 Sept 2015
The alkali metals have relatively low melting point. Which one of the following alkali metals is expected to have the highest melting point?
1. A.Li
2. B.Na
3. C.K
4. D.Rb
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Answer: A
Q782015 · 27 Sept 2015
Consider the following reaction: $CH_{4} (g) + H_{2} O (g) 1270 K CO (g) + 3 H_{2} (g)$ In the reaction given above, the mixture of $CO$ and $H_{2}$ is:
1. A.natural gas
2. B.water gas
3. C.producer gas
4. D.industrial gas
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Answer: B
Q802015 · 27 Sept 2015
To weld metals together, high temperature is required. Such a high temperature is obtained by burning:
1. A.Acetylene in oxygen
2. B.LPG in oxygen
3. C.Methane in oxygen
4. D.Acetylene in nitrogen
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Answer: A
Q822015 · 27 Sept 2015
Boric acid is an acid because its molecule:
1. A.accepts $O H^{-}$ from water releasing proton
2. B.combines with proton from water molecule
3. C.contains replaceable $H^{+}$ ion
4. D.gives up a proton
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Answer: A
Q832015 · 27 Sept 2015
The main constituent of Vinegar is:
1. A.Acetic acid
2. B.Ascorbic acid
3. C.Citric acid
4. D.Tartaric acid
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Answer: A
Q852015 · 27 Sept 2015
Which of the following are the properties of an electron? 1. Electron is a constituent of cathode ray 2. Electron is a negatively charged particle 3. The mass of the electron is equal to the mass of the proton 4. Electron is deflected by the electric field but not by magnetic field Select the correct answer using the code given below:
1. A.1 and 2 only
2. B.1, 2 and 3
3. C.3 and 4
4. D.1 and 4
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Answer: A
Q862015 · 27 Sept 2015
Which of the following statements regarding heavy water are correct? 1. It is extensively used as a moderator in nuclear reactors 2. It cannot be used in exchange reaction to study reaction mechanism 3. Viscosity of heavy water is relatively smaller than that of ordinary water 4. The dielectric constant of heavy water is smaller than that of ordinary water Select the correct answer using the code given below:
1. A.1 and 2
2. B.2 and 3
3. C.3 and 4
4. D.1 and 4
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Answer: D
Q882015 · 27 Sept 2015
Graphite is a much better conductor of heat and electricity than diamond. This is due to the fact that each carbon atom in graphite:
1. A.undergoes $s p^{2}$ hybridization and forms three sigma bonds with three neighbouring carbon atoms
2. B.undergoes $s p^{3}$ hybridization
3. C.is tetrahedrally bonded
4. D.is free from van der Waals force
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Answer: A
Q912015 · 27 Sept 2015
Which one of the following is not a Green House Gas?
1. A.Water vapours
2. B.Methane
3. C.Ozone
4. D.Carbon Monoxide
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Answer: D
Q922015 · 27 Sept 2015
Muscle fatigue is due to the accumulation of:
1. A.Cholesterol
2. B.Lactic acid
3. C.Lipoic acid
4. D.Triglycerides
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Answer: B