General Science

Sound waves cannot travel through a

  1. copper wire placed in air
  2. silver slab placed in air
  3. glass prism placed in water
  4. wooden hollow pipe placed in vacuum

Which one of the following is the correct relation between the Kelvin temperature (T) and the Celsius temperature (tc)?

  1. These are two independent temperature scales
  2. T = tc
  3. T = tc - 273.15
  4. T = tc + 273.15

Why is argon gas used along with tungsten wire in an electric bulb?

  1. To increase the life of the bulb
  2. To reduce the consumption of electricity
  3. To make the emitted light colored
  4. To reduce the cost of the bulb

Which one of the following elements is essential for the formation of chlorophyll in green plants?

  1. Calcium
  2. Iron
  3. Magnesium
  4. Potassium

Which one of the following gases dissolves in water to give acidic solution?

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

Which one of the following elements is involved in the control of water content of the blood?

  1. Potassium
  2. Lithium
  3. Rubidium
  4. Caesium

Which one of the following elements is used as a timekeeper in atomic clocks?

  1. Potassium
  2. Caesium
  3. Calcium
  4. Magnesium

Which one of the following is the scientific name of the causal organism of elephantiasis?

  1. Ascaris lumbricoides
  2. Culex pipiens
  3. Wuchereria bancrofti
  4. Fasciola hepatica

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

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.

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

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

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

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

The mirrors used as rear-view mirrors in vehicles are

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

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 ionization energy of hydrogen atom in the ground state is

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

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 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

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 term 'Probiotic' is applied to

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

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

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

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

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