General Science

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

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

Step-up transformers are used for

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

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

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

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

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

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

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

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

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

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

Bats detect obstacles in their path by receiving the reflected

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

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

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

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

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

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 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

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

At which place Earth’s magnetic field becomes horizontal?

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

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

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

Night blindness is caused by the deficiency of

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

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

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

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

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

Which one of the following is a reducing substance?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Electricity is produced through dry cell from

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

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

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

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

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