Khub.info Learn TNPSC exam and online pratice

Q1. A hydrogen inflated polythene balloon is relased from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will .....

decrease in size

flatten into a disc-like shape

increase in size

maintain the same size and shape

Q2. Consider the following statements: (1) Steam at 100 C and boiling water at 100 C contain same amount of heat. (2) Latent heat of fusion of ice is equal to the latent heat of vaporisation of water. (3) In an air conditioner, heat is extracted from the room-air at the evaporator coils and is rejected out at the condenser coils. Which of these statements is/are correct?

1 and 2

2 and 3

only 2

only 3

Q3. Consider the following statements: (1) A 4 wheel vehicle moving in a sharp circular path at high speed will (1) overturn about its outer wheels. (2) overturn about its inner wheels (3) Skid onwards (4) Skid inwards. Which of these statements are correct?

1 and 3

2 and 4

2 and 3

1 and 4

Q4. Diffusion of light in the atmosphere takes place due to ....

carbon dioxide

Dust particles

Helium

Water vapours

Q5. An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then .....

remains horizontal

is inclined to the horizontal with smaller depth at the rear end

is inclined to the horizontal with larger depth at the rear end

assumes parabolic curve

Q6. Which one of the following statements is NOT correct?

The velocity of sound in air increases with the increse of temperature

The velocity of sound in air is independent of pressure

The velocity of sound in air decreases as the humidity increases

The velocity of sound in air is not affected by the change in amplitude and frequency

Q7. Assertion (A): With the increase of temperature, the viscosity of glycerine increases. Reason (R}: Rise of temperature increases kinetic energy of the molecules.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q8. Assertion (A): An iron ball floats on mercury but gets immersed in water. Reason (R}: The specific gravity of iron is more than that of mercury.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q9. Which one of the following statements is NOT correct?

The boiling point of an aqueous solution is higher than that of pure water

Addition of solutes to a solution causes an increase in its water potential

The vapour pressure of the water in a solution is lower than that of pure water

When a solution is separated from wter by a semi permeable membrane, water movement can be prevented by applying pressure to the solution.

Q10. Consider the following natural phenomena: (1) Terrestrial heating (2) Reflection of light (3) Refraction of light (4) Diffraction of light. Due to which of thee phenomena is mirage formed?

1 and 2

2, 3 and 4

1 and 3

4 pm;u

Q11. "Graphene" has been in the news in the recent past. What is its importance? (1) it is two dimensional material and has good electrical conductivity. (2) it is one of the thinnest but strongest materials tested so far. (3) it is entirely made of silicon and has high optical transparency. (4) it can be used as conducting electrodes required for touch screens, LCDs and organic LEDs. Pick the correct statement/s.

1 and 2 only

3 and 4 only

1,2 and 4 only

all of them

Q12. Consider the following statements: (1) Light of longer wavelength is scattered much more than the light of shorter wavelength. (2) The speed of visible light in water is 0.95 times the speed in vacuum. (3) Radio waves are produced by rapidly oscillating electrical currents. (4) To detect the overspeeding vehicles, police use the Doppler effect of reflected short radio waves. Which of these statements are correct?

1 and 2

1 and 3

2 and 4

3 and 4

Q13. In an atom, the order of filling up of the orbitals is governed by ....

Aufbau principle

Heisenberg's uncertainty principle

Hund's rule

Pauli's exclusion principle

Q14. Consider the following statements: A simple pendulum is set into oscillation. Then, (1) The acceleration is zero when the bob passes through the mean position. (2) In each cycle the bob attains a given velocity twice. (3) Both acceleration and velocity of the bob are zero when it reaches its extreme position during its oscillation. (4) The amplitude of oscillation of the simple pendulum decreases with time. Which of these statements are correct?

1 and 2

3 and 4

1, 2 and 4

2, 3 and 4

Q15. Two wires have their lengths, diameters and resistivities, all in the ratio of 1:2. If the resistance of the thinner wire is 10 ohms, then the resistance of the thicker wire is .....

5 ohms

10 ohms

20 ohms

40 ohms

Q16. Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent of the surface of water. Reason {R}: The light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q17. Assertion (A): The boiling point of water decreases as the altitude increases. Reason {R}: The atmospheric pressure increases with altitude.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q18. Assertion (A): A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece. Reason {R}: The density of copper is more than that of glass.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q19. Which one of the following is NOT radioactive?

Astatine

Francium

Tritium

Zirconium

Q20. When lightwaves pass from air to glass, the variables affected are .....

wavelength, frequency and velocity

velocity and frequency

Wavelength and frequency

wavelength and velocity

Q21. When wter is heated from 0 degree C to 10 degree C, its volume ....

increases

decreases

does not change

first decreases and then increases.

Q22. Consider the following statements: In a nuclear reactor, self sustained chain reaction is possible, because (1) More neutrons are released in each of the fission reactions. (2) The neutrons immediately take part in the fission process. (3) The fast neutrons are slowed down by Graphite. (4) Every neutron released in the fission reaction initiates further fission. Which of these statements are correct?

1, 2 and 3

1 and 3

2 and 4

2, 3, and 4

Q23. Match the following characteristics (in alphabets) with the Particles to which they belong (in numbers): (A) Zero Mass (B) Fractional Charge (C} Fractional Spin (D) Integral Spin ..... (1) Positron (2) Neutrino (3) Quark (4) Phonon.

A2, B3, C1, D4

A3, B2, C4, D1

A2, B3, C4, D1

A3, B2, C1, D4

Q24. Which one of the following does a TV remote control unit use to operate a TV set?

Lightr Waves

Sound Waves

Microwaves

Radio Waves

Q25. Fluorescent tubes are fitted with a choke. The choke coil .....

steps up the line voltage

steps down the line voltage

chokes low frequency currents

reduces current in the circuit

Q26. For reproduing sound, a CD audio player uses a ......

Quartz crystal

Titanium needle

Laser beam

Barium titanate ceramic

Q27. When a CD is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of ......

Reflection and diffraction

Reflection and transmission

Diffraction and transmission

Refraction , diffraction and transmission

Q28. Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling. Reason {R}: If no external force acts on a system, its momentum cannot change.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q29. Assertion (A): Small glass beads fixed on traffic signals glow brightly when light falls upon them. Reason {R}: Light is totally reflected when the angle of incidence exceeds a certain critial value and light travelling in a denser medium is reflected from a rarer medium.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q30. For which one of the following, capillarity is NOT the only reason?

Blotting of ink

Rising of underground water

Spread of water drop on a cotton cloth

Rising of water from the roots of a plant to its foliage.

Q31. Low Temperatures (Cryogenics) find application in .....

Space travel, surgery and magnetic levitation

Surgery, magnetic levitation and telemetry

Space travel, surgery and telemetry

Space travel, magnetic levitation and telemetry

Q32. Consider the following statements: All ordinary light bulb has a rather short life because the (1) Filament wire is not uniform. (2) Bulb cannot be evacuated completely. (3) Wires supporting the filament melt at high temperatures. Which of the above statements is/are correct?

1 and 3

2 and 3

1 and 2

1, 2 and 3

Q33. Consider the following statements regarding a motor car battery: (1) The voltage is usually 12 V. (2) Electrolyte used is hydrochloric acid. (3) Electrodes are lead and copper. (4) Capacity is expressed in ampere hour. Which of the above statements are correct?

1 and 2

2 and 3

3 and 4

1 and 4

Q34. Match the following Quantity (in alphabets) with their Units (in numbers): (A) High Speed (B) Wavelength (C} Pressure (D) Energy ..... (1) Mach (2) Angstrom (3) Pascal (D) Joule

A2, B1, C3, D4

A1, B2, C4, D3

A1, B2, C3, D4

A2, B1, C4, D3

Q35. Consider the following statements: (1) If a person looks at a coin which is in a bucket of wter, the coin will appear to be closer than it really is. (2) If a person under water looks at a coin above he water surface, the coin will appear to be at a higher level than it really is. Which of the above statements is/are correct?

1 and 2

1 alone

2 alone

Neither 1 nor 2

Q36. Which of the following elements is essential for the constrution of nuclear reactors?

Zirconium

Tungsten

Nickel

Cobalt

Q37. A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct?

It is connected in parallel with the main switch

it is made mainly from silver alloys

it must have a low melting point

it must have a very high resistance.

Q38. Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason {R}: Collision of metal atoms with each other releases heat energy.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q39. A girl is swinging on a swing in sittion position. When the same girl stands up, the period of swing will .....

be shorter

be longer

depend on the height of the girl

No change.

Q40. The working principle of a washing machine is .....

centrifugation

dialysis

reverse osmosis

diffusion

Q41. The tendency of a liquid drop to contract and occupy minimum area is due to

Surface tension is increased

viscosity

Density

vapour pressure

Q42. Which one of the following is a vector quantity?

Momentum

Pressure

Energy

Work

Q43. Which one of the following is paramagnetic in nature?

iron

hydrogen

oxygen

nitrogen

Q44. When an air bubble at the bottom of a lake rises to the top, it will .....

increase in size

decrease in size

maintain its size

flatten into a dishlike shape

Q45. Total internal reflection can take place when light travels from .....

air to glass

air to water

water to glass

diamond to glass

Q46. Assertion (A): Transformer is useful for stepping up or stepping down voltages. Reason {R}: Transformer is a device used in DC circuits.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Q47. The alpha particles carries two positive charges. Its mass is very nearly equal to that of ....

two protons

an atom of helium

Sum of masses of two positrons and two neutrons

Two positrons as each positron carries a single positive charge

Q48. When the frequency distribution is normal ....

Median, mode and mean are all different from one another

Mean, mode and median are identical

Mean is greater than mode

Mean is greater than median.

Q49. Domestic electrical wiring is basically a ......

series connection

series connection within each room and parallel connection elsewhere

parallel connection

combination of series and parallel connections.

Q50. Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers etc., ?

Nickel and Cadmium

Zinc and Carbon

Lead peroxide and Lead

Iron and Cadmium

Answers Evaluate

WEBSITE AND DATABASE FOR SALE

Browse by Chapter