General Science · NDA previous year questions

Turpentine oil in paints is used as a

1. A.pigment
2. B.film-forming material
3. C.thinner
4. D.drier

What is the oxidizing agent in the following equation? $\mathrm{HAs}{\mathrm{O}}_2(\mathrm{aq})+\mathrm{S}{\mathrm{n}}^{2+}(\mathrm{aq})+{\mathrm{H}}^{+}(\mathrm{aq})\to$ $\mathrm{As}(\mathrm{s})+\mathrm{S}{\mathrm{n}}^{4+}(\mathrm{aq})+{\mathrm{H}}_2\mathrm{O}(\mathrm{l})$

1. A.$\mathrm{HAs}{\mathrm{O}}_2(\mathrm{aq})$
2. B.$\mathrm{S}{\mathrm{n}}^{2+}(\mathrm{aq})$
3. C.${\mathrm{H}}^{+}(\mathrm{aq})$
4. D.$\mathrm{S}{\mathrm{n}}^{4+}(\mathrm{aq})$

Which one of the following substances is most likely to be used as soap?

1. A.$\mathrm{C}{\mathrm{H}}_3(\mathrm{C}{\mathrm{H}}_2{)}_{12}\mathrm{COOC}{\mathrm{H}}_3$
2. B.$\mathrm{C}{\mathrm{H}}_3(\mathrm{C}{\mathrm{H}}_2{)}_5\mathrm{O}(\mathrm{C}{\mathrm{H}}_2{)}_5\mathrm{C}{\mathrm{H}}_3$
3. C.$\mathrm{C}{\mathrm{H}}_3(\mathrm{C}{\mathrm{H}}_2{)}_{12}\mathrm{COONa}$
4. D.$\mathrm{C}{\mathrm{H}}_3(\mathrm{C}{\mathrm{H}}_2{)}_{12}\mathrm{CHC}{\mathrm{l}}_2$

Which one of the following is not a part of female reproductive system?

1. A.Fallopian tube
2. B.Cervix
3. C.Urethra
4. D.Vagina

From which part of turmeric, is the turmeric powder obtained?

1. A.Dried rhizome
2. B.Dried root
3. C.Dried fruit
4. D.Seed

Muscles of which one among the following body parts contract slowly but can remain contracted for a longer time?

1. A.Face
2. B.Arms
3. C.Intestine
4. D.Legs

If the length of a simple pendulum is being increased by 4-fold, time period of oscillation will be

1. A.decreased by 4-fold.
2. B.increased by 4-fold.
3. C.decreased to half of the initial value.
4. D.increased by a factor of 2 of its initial value.

A mixture of sodium chloride and naphthalene can be separated by

1. A.extraction with hot water
2. B.extraction with cold water
3. C.sublimation
4. D.steam distillation

Turmeric (Haldi) rapidly becomes colourless on addition of

1. A.Baking soda
2. B.Vinegar
3. C.Lemon juice
4. D.Alcohol

If $d$ denotes the distance covered by a car in time t and $\vec{S}$ denotes the displacement by the car during the same time, then

1. A.$d\le |\vec{S}|$
2. B.$d=|\vec{S}|\text{ only}$
3. C.$d\ge |\vec{S}|$
4. D.$d<|\vec{S}|$

The sex of a newborn baby is determined by the chromosome inherited from

1. A.the mother
2. B.the father
3. C.mother’s mother
4. D.father’s father

The phenomenon of radioactivity was discovered by

1. A.Marie Curie
2. B.Pierre Curie
3. C.Henri Becquerel
4. D.J. J. Thomson

The principle of cleaning by soap is

1. A.surface tension
2. B.floatation
3. C.viscosity
4. D.elasticity

The main thinking part of the brain is

1. A.midbrain
2. B.hypothalamus
3. C.forebrain
4. D.hindbrain

Which one among the following has completed thirty years of its development on 1st January, 2013?

1. A.Transmission Control Protocol/Internet Protocol (TCP/IP)
2. B.Computer Network
3. C.Social Networking Sites
4. D.Network Control Protocol (NCP)

Which one among the following is not included in the major clinical sign as a case definition of AIDS in children < 12 years of age?

1. A.Persistent cough for more than 1 month
2. B.Loss of weight
3. C.Chronic diarrhoea
4. D.Prolonged fever

Which one among the following is the hardest part of our body?

1. A.Skull bones of head
2. B.Thumb nails
3. C.Enamel of teeth
4. D.Spinal vertebra

Consider the following statements : 1. Diamond is hard and graphite is soft. 2. Diamond is soft and graphite is hard. 3. Diamond is a bad conductor but graphite is a good conductor. 4. Diamond is a good conductor but graphite is a bad conductor. Which of the statements given above is/are correct ?

1. A.1 and 3
2. B.1 only
3. C.2 and 3
4. D.1 and 4

Which one among the following equations is correctly balanced ?

1. A.$\mathrm{NaOH}+\mathrm{Al}+{\mathrm{H}}_2\mathrm{O}\to 2{\mathrm{H}}_2+\mathrm{NaAl}{\mathrm{O}}_2$
2. B.$2NaOH+2Al+2{\mathrm{H}}_2\mathrm{O}\to 3{\mathrm{H}}_2+2NaAl{\mathrm{O}}_2$
3. C.$2NaOH+2Al+3{\mathrm{H}}_2\mathrm{O}\to 4{\mathrm{H}}_2+2NaAl{\mathrm{O}}_2$
4. D.$2NaOH+2Al+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{H}}_2+2NaAl{\mathrm{O}}_2$

Given below is an approximate composition of a substance : $\mathrm{CaO}$ 60-70% $\mathrm{Si}{\mathrm{O}}_2$ 20-25% $\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$ 5-10% $\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3$ 2-3% The substance is

1. A.Plaster of Paris
2. B.Cement
3. C.Marble stone
4. D.Quartz

Consider the following figure : Which of the following labelled points in the figure given above indicate unstable state of an object ?

1. A.Point A only
2. B.Point B only
3. C.Points A and C
4. D.Points B and D

One feels heavier in a lift when the lift

1. A.is going down steadily
2. B.just begins to go up
3. C.is moving up steadily
4. D.descends freely

Which one among the following statements about thermal conductivity is correct ?

1. A.Steel > Wood > Water
2. B.Steel > Water > Wood
3. C.Water > Steel > Wood
4. D.Water > Wood > Steel

Which one among the following is the true representation of (i) variable DC potential (ii) rheostat and (iii) AC ammeter respectively?

1. A.Option A
2. B.Option B
3. C.Option C
4. D.Option D

An iron ball and a wooden ball of the same radius are released from a height ‘H’ in vacuum. The time taken to reach the ground will be

1. A.more for the iron ball
2. B.more for the wooden ball
3. C.equal for both
4. D.in the ratio of their weights