Chemistry · NDA previous year questions

Which one of the following materials is not an allotrope of carbon ?

1. A.Diamond
2. B.Graphene
3. C.Fly ash
4. D.Fullerene

Which one of the following reactions does not result in the evolution of hydrogen gas?

1. A.Reaction of zinc metal with dilute sulphuric acid solution
2. B.Mixing water to Plaster of Paris
3. C.Heating zinc metal with sodium hydroxide solution
4. D.Reaction of potassium metal with water

Which one of the following acids is predominantly found in tomatoes?

1. A.Acetic acid
2. B.Tartaric acid
3. C.Oxalic acid
4. D.Lactic acid

Which one of the following conclusions could not be derived from Rutherford's α-particle scattering experiment?

1. A.Most of the space in the atom is empty
2. B.The radius of the atom is about $10^5$ times the radius of the nucleus
3. C.Electrons move in a circular path of fixed energy called orbits
4. D.Nearly all the mass of the atom resides in the nucleus

Reaction of quick lime ($\mathrm{CaO}$) with water to produce slaked lime ($\mathrm{Ca}(\mathrm{OH}{)}_2$) is an example of

1. A.Displacement reaction
2. B.Endothermic reaction
3. C.Decomposition reaction
4. D.Exothermic reaction

Which one of the following statements is true for a simple harmonic oscillator?

1. A.Force acting is directly proportional to the displacement from the mean position and is in same direction.
2. B.Force acting is directly proportional to the displacement from the mean position and is in opposite direction
3. C.Acceleration of the oscillator is constant
4. D.The velocity of the oscillator is not periodic

When light scattered by a molecule and the frequency of the scattered light is changed, this phenomenon is called

1. A.Rayleigh scattering
2. B.Raman effect
3. C.Photoelectric effect
4. D.Rutherford scattering

Chalk and marble are different forms of

1. A.Calcium hydrogen carbonate
2. B.Calcium carbonate
3. C.Calcium acetate
4. D.Sodium carbonate

The number of maximum electrons in N Shell is

1. A.2
2. B.8
3. C.18
4. D.32

Vinegar is also known as

1. A.ethanoic acid
2. B.nitric acid
3. C.sulphuric acid
4. D.tartaric acid

A liquid is kept in a glass beaker. Which one of the following statements is correct regarding the pressure exerted by the liquid column at the base of the beaker ?

1. A.The pressure depends on the area of the base of the beaker
2. B.The pressure depends on the height of liquid column
3. C.The pressure does not depend on the density of the liquid
4. D.The pressure neither depends on the area of the base of the beaker nor on the height of liquid column

Which one of the following statements is NOT correct ?

1. A.Buckminsterfullerene is an allotrope of carbon
2. B.Diamond is a good conductor of electricity
3. C.Graphite is a good conductor of electricity
4. D.In graphite, each carbon atom is linked to three other carbon atoms

How many covalent bonds are present in a Chloropropane molecule having molecular formula, ?

1. A.6
2. B.8
3. C.9
4. D.10

Which one of the following is the most fundamental characteristic of an element ?

1. A.Melting point
2. B.Atomic number
3. C.Colour
4. D.Atomic weight

Atomic mass of an element is equal to the sum of number of

1. A.electrons and protons only
2. B.protons and neutrons only
3. C.electrons and neutrons only
4. D.electrons, protons and neutrons

Which one of the following element’s isotope is used in the treatment of cancer ?

1. A.Uranium
2. B.Cobalt
3. C.Sodium
4. D.Iodine

In an incandescent electric bulb, the filament of the bulb is made up of which metal ?

1. A.Aluminium
2. B.Copper
3. C.Tungsten
4. D.Silver

A metallic wire having resistance of $20\Omega$ is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to

1. A.$20\Omega$
2. B.$10\Omega$
3. C.$5\Omega$
4. D.$15\Omega$

Which one of the following is the largest composition in biogas ?

1. A.Carbon dioxide
2. B.Methane
3. C.Hydrogen
4. D.Hydrogen sulphide

At nearly 70°C, sodium bicarbonate shows the property of gradually decomposing, which makes it usable in bakery products. The product of decomposition responsible for this use of sodium bicarbonate is

1. A.Carbon dioxide
2. B.Hydrogen
3. C.Water vapour
4. D.Oxygen

Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are

1. A.5, 10 and 2 respectively
2. B.10, 2 and 5 respectively
3. C.5, 2 and 10 respectively
4. D.2, 5 and 10 respectively

Which one of the following is the best example of desiccant ?

1. A.Silica gel
2. B.Polystyrene
3. C.Sodium chloride
4. D.Sodium carbonate

Which one of the following was the first mineral acid discovered ?

1. A.Sulphuric acid
2. B.Hydrochloric acid
3. C.Nitric acid
4. D.Phosphoric acid

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.

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