NECO Past Questions and Answers - Page 247

1,232.

What is the angular velocity of an object in a horizontal circular path of radius 1.5m with a constant speed of 12ms-1?

A.

1.6 rads-1

B.

4.0 rads-1

C.

8.0 rads-1

D.

16.0rads-1

E.

32.0 rads-1

Correct answer is C

No explanation has been provided for this answer.

1,233.

The inside of a vacuum flask is usually coated with silver to reduce heat loss by

A.

condensation

B.

conduction

C.

convection

D.

evaporation

E.

radiation

Correct answer is E

No explanation has been provided for this answer.

1,234.

Which statement is NOT correct about molecules?

A.

The number of molecules in a unit volume of a solid is greater than that in a unit volume of a liquid or gas.

B.

Molecules are made up of atoms

C.

The force of attraction between two molecules of a solid is greater than that between two molecules of a liquid or gas

D.

Molecules of gases are in regular motion

E.

Molecules of a solid vibrate about their mean positions.

Correct answer is D

No explanation has been provided for this answer.

1,235.

An astronaut is walking on the moon where the magnitude of the acceleration due to gravity "g’ is one-sixth that on earth. Compared with their magnitudes on the earth, his mass and weight on the moon are

A.

both less

B.

less and the same respectively

C.

the same and less respectively

D.

the same as on earth

E.

both greater

Correct answer is C

No explanation has been provided for this answer.