CDS Questions

The gastrointestinal hormones namely secretin and cholecystokinin

• GB Life Processes

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

1. stomach and small intestine
2. gall bladder and stomach
3. pancreas and gall bladder
4. pancreas and stomach

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

• GB Health

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

1. spread of solid tumour
2. bone density
3. extent of brain haemorrhage
4. ulcerous growth in blood

Sickle-cell anaemia is a disease caused due to

• GB Health

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 diseases in humans can spread through air

• GB Health

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

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

Which are found in both plant and animal cells

• GB Cells Tissues

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 statements about sexual reproduction in flowering plants are correct

• GB Reproduction Heredity

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

• GB Living Organisms

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

• GP Motion Force

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

• GC Matter

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

• GP Measurement
• GP Motion Force

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

• GC Metals Non-Metals

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

1. Bromine
2. Boron
3. Krypton
4. Radon

Which one of the following is a reducing substance

• GC Acids Bases Salts

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

• GC Metals Non-Metals

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

• GB Food Nutrition

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

• GB Health

Night blindness is caused by the deficiency of

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

Which devices changes low voltage alternating current to high voltage

• GP Magnetism

Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?

1. Generator
2. Motor
3. Transformer
4. Vibrator

An optical illusion which occurs mainly in deserts

• GP Light

An optical illusion which occurs mainly in deserts during hot summer is based on the principle of

1. Reflection
2. Interference
3. Dispersion
4. Total internal reflection

At which place Earth’s magnetic field becomes horizontal

• GP Magnetism

At which place Earth’s magnetic field becomes horizontal?

1. Magnetic meridian
2. Magnetic equator
3. Geographical pole
4. Tropic of Cancer

The speed of a car travelling on a straight road

• GP Motion Force

The speed of a car travelling on a straight road is listed below at successive intervals of 1 s:
Time (s)        0 1 2 3 4
Speed (m/s)  0 2 4 6 8

Which of the following is/are correct?

The car travels

1. with a uniform acceleration of 2 m/s².
2. 16 m in 4 s.
3. with an average speed of 4 m/s.

Select the correct answer using the code given below:

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

The speed of a body that has Mach number more than 1

• GP Sound Waves

The speed of a body that has Mach number more than 1 is

1. supersonic
2. subsonic
3. 300 m/s
4. about 10 m/s

Consider the following reaction: CH4 + 2O2 → CO2 + 2H2O

• GC Acids Bases Salts

Consider the following reaction:

CH₄ + 2O₂ → CO₂ + 2H₂O

Which of the following about the reaction given above is/are correct?

1. Carbon is oxidized.
2. Hydrogen is oxidized.
3. Hydrogen is reduced.
4. Carbon is reduced.

Select the correct answer using the code given below:

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

The desirable range of pH for drinking water is

• GC Acids Bases Salts

The desirable range of pH for drinking water is

1. 6.5 to 8.5
2. 5.0 to 6.5
3. 6.5 to 7.0
4. 7.0 to 8.5

Which one of the following is a cause of acid rains

• GS Environment

Which one of the following is a cause of acid rains?

1. Ozone
2. Ammonia
3. Sulphur dioxide
4. Carbon monoxide

Which waves does not belong to the category of the other three

• GP Sound Waves

Which one of the following waves does not belong to the category of the other three?

1. X-rays
2. Microwaves
3. Radio waves
4. Sound waves

Bats detect obstacles in their path by receiving the reflected

• GP Sound Waves

Bats detect obstacles in their path by receiving the reflected

1. Infrasonic waves
2. Ultrasonic waves
3. Radio waves
4. Microwaves

A rainbow is produced due to which one of the following phenomena

• GP Light

A rainbow is produced due to which one of the following phenomena?

1. Dispersion of light
2. Interference of light
3. Diffraction of light
4. Scattering of light by atmospheric dust

Why is potassium permanganate used for purifying drinking water

• GC Acids Bases Salts

Why is potassium permanganate used for purifying drinking water?

1. It kills germs
2. It dissolves the impurities
3. It is a reducing agent
4. It is an oxidizing agent

Which chemicals is used as washing soda

• GC Metals Non-Metals

Which one among the following chemicals is used as washing soda?

1. Calcium carbonate
2. Calcium bicarbonate
3. Sodium carbonate
4. Sodium bicarbonate

Which gases is placed second in respect of abundance in the Earth's atmosphere

• GS Environment

Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?

1. Oxygen
2. Hydrogen
3. Nitrogen
4. Carbon dioxide

Zinc is used to protect iron from corrosion because

• GC Acids Bases Salts
• GC Metals Non-Metals

Zinc is used to protect iron from corrosion because zinc is

1. more electropositive than iron
2. cheaper than iron
3. a bluish white metal
4. a good conductor of heat and electricity

How much CO2 is produced on heating of 1 kg of carbon

• GC Atomic Structure

How much CO₂ is produced on heating of 1 kg of carbon?

1. 11/3 kg 
2. 3/11 kg
3. 4/3 kg
4. 3/4 kg

Which waves carries the maximum energy per photon

• GP Sound Waves

Which one among the following waves carries the maximum energy per photon?

1. X-rays
2. Radio waves
3. Light waves
4. Microwaves

Step-up transformers are used for

• GP Magnetism

Step-up transformers are used for

1. increasing electrical power
2. decreasing electrical power
3. decreasing voltage
4. increasing voltage

If some object is weighed when submerged in water

• GP Solids Fluids

If some object is weighed when submerged in water, what will happen to its weight compared to its weight in air?

1. Increase
2. Decrease
3. Remain exactly the same
4. Increase or decrease cannot be predicted

Concave mirror is used in headlights of vehicles, because it

• GP Light

Concave mirror is used in headlights of vehicles, because it

1. focuses light from the bulb onto nearby vehicles
2. sends parallel rays
3. fits well into the shape of the headlight
4. is cheaper than other mirrors

Water boils at a lower temperature at high altitudes, because

• GS Water

Water boils at a lower temperature at high altitudes, because

1. the air pressure is less
2. outside temperature is less
3. less latent heat is less
4. None of the above

Which microbes causes acidification and curdling of milk

• GB Living Organisms

Which one of the following microbes causes acidification and curdling of milk?

1. Lactic Acid Bacillus
2. Clostridium botulinum
3. Vibrio cholerae
4. Saccharomyces cerevisiae

The term 'Probiotic' is applied to

• GB Health

The term 'Probiotic' is applied to

1. Organic food
2. Antacid
3. Antibiotic
4. Live microbial food supplement

Which statements about magnetite ore of iron are correct?

• GC Metals Non-Metals

Which of the following statements about magnetite ore of iron is/are correct?

1. It is known as black ore.
2. It contains 60% to 70% of pure iron.
3. It possesses magnetic properties.

Select the correct answer using the codes given below:

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

The compound C6H12O4 contains

• GC Atomic Structure

The compound C₆H₁₂O₄ contains

1. 22 atoms per mole
2. twice the mass percent of H as compared to the mass percent of C
3. six times the mass percent of C as compared to the mass percent of H
4. thrice the mass percent of H as compared to the mass percent of 0

When pure water boils vigorously, the bubbles that rise

• GS Water

When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of

1. air
2. hydrogen
3. hydrogen and oxygen
4. water vapour

The ionization energy of hydrogen atom in the ground state is

• GC Atomic Structure

The ionization energy of hydrogen atom in the ground state is

1. 13.6 MeV
2. 13.6 eV
3. 13.6 Joule
4. Zero

Which waves is used for detecting forgery in currency notes

• GP Sound Waves

Which one of the following waves is used for detecting forgery in currency notes?

1. Ultraviolet waves
2. Infrared waves
3. Radio waves
4. Microwaves

The mirrors used as rear-view mirrors in vehicles are

• GP Light

The mirrors used as rear-view mirrors in vehicles are

1. concave
2. convex
3. cylindrical
4. plane

How long does light take to reach the Earth from the Sun

• GP Light

How long does light take to reach the Earth from the Sun?

1. About 4 minutes
2. About 8 minutes
3. About 24 minutes
4. About 24 hours

Electron emission from a metallic surface by application of light

• GC Atomic Structure

Electron emission from a metallic surface by application of light is known as

1. Thermionic emission
2. Photoelectric emission
3. High field emission
4. Autoelectronic emission

In a vacuum, a five-rupee coin, a feather of a sparrow bird and a mango are dropped

• GP Motion Force

In a vacuum, a five-rupee coin, a feather of a sparrow bird and a mango are dropped simultaneously from the same height. The time taken by them to reach the bottom is t₁, t₂ and t₃ respectively. In this situation, we will observe that

1. t₁ > t₂ > t₃
2. t₁ > t₃ > t₂
3. t₃ > t₁ > t₂
4. t₁ = t₂ = t₃

The force acting on a particle of mass m moving along the x-axis

• GP Work Energy

The force acting on a particle of mass m moving along the x-axis is given by F(x) = Ax² - Bx. Which one of the following is the potential energy of the particle?

1. 2Ax - B
2. -x²/6 (2Ax - 3B)
3. Ax³ - Bx²
4. Zero

An object moves in a circular path with a constant speed

• GP Motion Force

An object moves in a circular path with a constant speed. Which one of the following statements is correct?

1. The centripetal acceleration of the object is smaller for a gentle curve (i.e., curve of larger radius) than that for a sharp curve (i.e., curve of smaller radius).
2. The centripetal acceleration is greater for a gentle curve than that for a sharp curve.
3. The centripetal acceleration is the same for both, the gentle and sharp curves.
4. The centripetal acceleration causes the object to slow down.

Golden rice is a genetically-modified crop plant where the incorporated gene

• GB Reproduction Heredity

Golden rice is a genetically-modified crop plant where the incorporated gene is meant for biosynthesis of

1. Omega-3 fatty acids
2. Vitamin A
3. Vitamin B
4. Vitamin C