SONAR is used for from Class 12 TET Previous Year Board Papers |

Subject

Science

Class

TET Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

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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


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


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


A.

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

Air-only supports shorter wavelengths whereas longer wavelengths are able to pass through water molecules undisturbed. Therefore, sonar having a longer wavelength is appropriately used in water to measure the distance, direction, and velocity of objects in the water.


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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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