1 N is equal to how many dynes?

• 10⁴

• 10⁵

• 10³

• 10⁶

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

• Conduction

• Convection

• Radiation

• All not required

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

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

Natural fibers are

• cotton

• wool

• silk

• All of these

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%

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

Asteroids are found in between the orbits of

• Saturn and Jupiter

• Mars and Jupiter

• Earth and Mars

• Saturn and Uranus

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

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