The velocity of sound in air is taken as 332 m/s. If the pressure

Subject

Science

Class

TET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

1 N is equal to how many dynes?

  • 104

  • 105

  • 103

  • 106


2.

Which mode of transportation of heat is essentially not required for the medium?

  • Conduction

  • Convection

  • Radiation

  • All not required


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3.

The velocity of sound in air is taken as 332 m/s. If the pressure of a gas is taken double, then what will be the velocity of sound in air?

  • 996 m/s

  • 664 m/s

  • 166 m/s

  • 332 m/s


D.

332 m/s

The speed of sound in an ideal gas depends only on its temperature and composition and not on pressure and air is considered as an ideal gas. So the velocity of sound will not be affected by changing pressure.


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4.

The escape velocity from the surface of the Earth is

  • 11.2 km/s

  • 11.2 m/s

  • 11.2 cm/s

  • 11.2 mm/s


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5.

Natural fibers are

  • cotton

  • wool

  • silk

  • All of these


6.

The composition percentage of CaO and SiO2 in Portland cement is

  • 40-45% and 10-15%

  • 85-90% and 40-45%

  • 60-68% and 17-24%

  • 3-10% and 80-90%


7.

Examples of Web Browser are

  1. Mozilla
  2. Opera
  3. Netscape Navigator
  4. Netscape
  5. Internet Explorer
  6. Mozilla Firefox

  • (i), (v) and (vi)

  • (ii), (iii) and (iv)

  • (i), (ii) and (iii)

  • All of these


8.

Asteroids are found in between the orbits of

  • Saturn and Jupiter

  • Mars and Jupiter

  • Earth and Mars

  • Saturn and Uranus


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9.

SONAR is used for

  • measuring distance, direction, and velocity of objects in the water

  • measuring distance, direction, and velocity of objects in the air

  • measuring the distance and direction of objects in the water

  • measuring direction and velocity of objects in air


10.

Which of the statements about the reaction given below are incorrect?

2 PbO(s) + C (s) → 2Pb (s) + CO2(g)

  1. Lead is getting reduced.
  2. Carbon dioxide is getting oxidised
  3. Carbon is getting oxidized.
  4. Lead oxide is getting reduced

  • (i) and (ii)

  • (i) and (iii)

  • (i), (ii) and (iii)

  • All of these


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