# CDS Questions

A close bottle containing water at room temperature was taken to the Moon and then the lid is opened. The water will

1. boil
2. freeze
3. not change at all
4. decompose into oxygen and hydrogen

Heat given to a body which raises its temperature by 1°C is known as

1. water equivalent
2. specific heat
4. thermal capacity

Bats can fly in dark because they

1. have strong wings
2. have sharp eyes
3. produce ultrasonic waves
4. are nocturnal

If the door of a running refrigerator in a closed room is kept open, what will be the net effect on the room?

1. It will make the temperature go up and down
2. It will make no difference on the average
3. It will heat the room
4. It will cool the room

Bernoulli's principle is based on which one among the following laws

1. Conservation of momentum
2. Conservation of angular momentum
3. Conservation of energy
4. Conservation of mass

Which of the following is not a result of surface tension?

1. Flow of a liquid
2. Capillary rise
3. Nearly spherical drop of rain
4. Removal of dirt by soap or detergent

If the motion of an object is represented by a straight line parallel to the time axis in a distance-time graph, then the object undergoes

1. decelerated motion
2. uniform non-zero velocity motion
3. accelerated motion
4. zero velocity motion

A force applied on a body is represented as

F = 6i - 8j + 10k

and accelerates is at 1 m/s2. The mass of the body is

1. 10√2 kg
2. 2√10 kg
3. 8 kg
4. 10 kg

A passenger in a moving train tosses a coin upward which falls behind him. It implies that the motion of the train is

1. uniform
2. retarded
3. accelerated
4. along the circular tracks

Two bodies A and B having masses m and 4m respectively are moving with equal linear momentum. The ratio of kinetic energies between A and B is

1. 1 : 2
2. 1 : 1
3. 4 : 1
4. 1 : 4

The dimension of impulse is the same as that of

1. pressure
2. angular momentum
3. linear momentum
4. work

A motor vehicle is moving on a circle with uniform speed. The net acceleration of the vehicle is

1. perpendicular to the radius and along the velocity
2. towards the centre of circle
3. away from the centre along the radius of the circle
4. zero

If the distance S covered by a moving car in rectilinear motion with a speed v in time t is given by S = vt, then the car undergoes

1. uniform velocity
2. uniform acceleration
3. non-uniform acceleration
4. non-uniform velocity

Two cars A and B have masses mA and mB respectively, with mA > mB. Both the cars are moving in the same direction with equal kinetic energy. If equal braking force is applied on both, then before coming to rest

1. A will cover a greater distance
2. B will cover greater distance
3. both will cover the same distance
4. distance covered by them will depend on their respective velocities

Planet A has double the radius than that of planet B. If the mass of planet A is 4 times heavier than the mass of planet B, which of the following statements regarding weight of an object is correct?

1. Heavier on Planet B than on Planet A
2. Same on both the Planets
3. Cannot be measured on Planet B
4. Heavier on Planet A than on Planet B

A bullet is fired vertically up from a 400 m tall tower with a speed 80 m/s. If g is taken as 10 m/s2, the time taken by the bullet to reach the ground will be

1. 24 s
2. 20 s
3. 16 s
4. 8 s

Within an animal cell, the most abundant inorganic constituent of protoplasm is

1. phosphate
2. water
3. sodium and potassium salt
4. iron

The main thinking part of the brain is

1. hypothalamus
2. midbrain
3. hindbrain
4. forebrain

Which one of the following is not a function of liver?

1. Production of urea
2. Absorption of food and excess water from the undigested food
3. Destruction of dead and worn-out red blood cells
4. Conversion of glucose into glycogen

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

1. Cervix
2. Vagina
3. Urethra
4. Fallopian tube

Balanced diet should have approximately

1. 3/5 protein, 1/5 fat and 1/5 carbohydrate
2. 1/5 protein, 1/5 fat and 3/5 carbohydrate
3. 1/2 protein, 1/4 fat and 1/4 carbohydrate
4. 1/5 protein, 3/5 fat and 1/5 carbohydrate

After diagnosis of disease in a person, the doctor advises the patient iron and folic acid tablets. The person is suffering from

1. goitre
2. osteoporosis
3. anaemia
4. protein-energy malnutrition

Which one of the following is the correct electronic configuration of chlorine

1. 7, 8, 2
2. 2, 8, 7
3. 2, 8, 8
4. 2, 7, 8

The distribution of electrons into different orbits of an atom, as suggested by Bohr, is

1. 2 electrons in the K-orbit, 8 electrons in the L-orbit, 32 electrons in the M-orbit
2. 2 electrons in the K-orbit, 8 electrons in the L-orbit, 16 electrons in the M-orbit
3. 2 electron in the K-orbit, 6 electrons in the L-orbit, 18 electrons in the M-orbit
4. 2 electrons in the K-orbit, 8 electrons in the L-orbit, 18 electrons in the M-orbit

In the reaction ZnO + C → Zn + CO, 'C' acts as

1. an acid
2. a base
3. an oxidising agent
4. a reducing agent

Which of the following acids is a mineral acid

1. Citric acid
2. Ascorbic acid
3. Tartaric acid
4. Hydrochloric acid

Dihydrogen can be prepared on a commercial scale by the action of steam on hydrocarbons, when a mixture of CO and H2 gas is formed. It is known as

1. industrial gas
2. producer gas
3. fuel gas
4. water gas

When carbon dioxide is passed through lime water, the solution turns milky, but, on prolonged passage, the solution turns clear. This is because

1. the calcium carbonate formed initially is converted to soluble calcium bicarbonate on passage of more carbon dioxide
2. the calcium bicarbonate formed initially is converted to soluble calcium carbonate on passage of more carbon dioxide
3. the reaction is reversible and lime water is regenerated
4. the initially formed insoluble compound is soluble in carbonic acid

What is the main constituent of a Pearl?

1. Calcium carbonate and magnesium carbonate
2. Calcium carbonate only
3. Calcium sulphate only
4. Calcium oxide and calcium sulphate

A nauticle mile is equal to

1. 5060 feet
2. 5280 feet
3. 6060 feet
4. 6080 feet

A person standing in front of a plane mirror approaches the mirror by 40 cm. The new distance between the person and his image in the plane mirror is

1. 60 cm
2. 1.4 m
3. 1.2 m
4. 2.0 m

If two conducting spheres are separately charged and then brought in contact

1. the total charge of the two spheres is conserved
2. both the total energy and the total charge are conserved
3. the final potential is always the mean of the original potential of the two spheres
4. the total energy of the two spheres is conserved

When you pull out the plug connected to an electrical appliance, you often observe a spark. To which property of the appliance is this related?

1. Resistance
2. Wattage
3. Capacitance
4. Inductance

Electricity is produced through dry cell from

1. Nuclear Energy
2. Mechanical Energy
3. Chemical Energy
4. Thermal Energy

Which of the statements given below are correct?

1. A person having blood group 'A' can donate blood to persons having blood group 'A' and blood group 'AB'.
2. A person having blood group 'AB' can donate blood to persons having blood groups 'A', 'B', 'AB' or 'O'.
3. A person with blood group 'O' can donate blood to persons having any blood group.
4. A person with blood group 'O' can receive blood from the person of any of the blood groups.

Select the correct answer using the code given below:

1. 1 and 3 only
2. 3 and 4 only
3. 1 and 2 only
4. 1, 2, 3 and 4

The gastrointestinal hormones namely secretin and cholecystokinin secreted by duodenal epithelium activate respectively which organs to discharge their secretions?

1. stomach and small intestine
4. pancreas and stomach

Dual-energy X-ray absorptiometry (DEXA) is used to measure

2. bone density
3. extent of brain haemorrhage
4. ulcerous growth in blood

Sickle-cell anaemia is a disease caused due to the abnormality in?

1. blood plasma composition
2. red blood cells
3. white blood cells
4. thrombocytes

Which one of the following diseases in humans can spread through air?

1. Goitre
2. HIV-AIDS
3. Tuberculosis
4. Dengue

Which of the following are found in both plant and animal cells?

1. Cell membrane, Chloroplast, Vacuole
2. Cell wall, Nucleus, Vacuole
3. Cell membrane, Cytoplasm, Nucleus
4. Cell wall, Chloroplast, Cytoplasm

Which of the following statements about sexual reproduction in flowering plants are correct?

1. Stamen is present in the centre of a flower.
2. Stamen produces pollen grains in the ovary.
3. The swollen bottom part of carpel is the ovary.
4. The fusion of germ cells gives rise to zygote.

Select the correct answer using the code given below

1. 2 and 4 only
2. 1 and 3 only
3. 2, 3 and 4 only
4. 1, 2, 3 and 4

In dry regions, the leaf size of a tree becomes smaller. It is so to

1. maintain natural growth
2. protect plant from animals
3. reduce metabolism
4. reduce transpiration

Newton's law of motion cannot be applicable to the particles moving at a speed comparable to the speed of

1. light
2. sound
3. rocket
4. bullet train

Bose-Einstein Condensate (BEC) is formed by cooling a gas of extremely low density, about one-hundred-thousandth the density of normal air. This is treated as

1. II state of matter
2. III state of matter
3. IV state of matter
4. V state of matter

Automobiles are fitted with a device that shows the distance travelled. Such a device is known as

1. Speedometer
2. Cathetometer
3. Odometer
4. Lactometer

Which one of the following non-metals is present in solid state?

1. Bromine
2. Boron
3. Krypton

Which one of the following is a reducing substance?

1. Oxygen
2. Iron
3. Potassium permanganate
4. Potassium dichromate

Which one of the following materials is not present in gun powder?

1. Sulphur
2. Charcoal
3. Potassium nitrate
4. Barium sulphate

Which one among the following is the richest source of vitamin C?

1. Apple
2. Banana
3. Amla
4. Papaya

Night blindness is caused by the deficiency of

1. Vitamin C
2. Vitamin A
3. Vitamin K
4. Vitamin B