NECO Physics Past Questions & Answers - Page 39

191.

A body that produces its own light is said to be

A.

luminous

B.

non-incandescent

C.

opaque

D.

translucent

E.

transparent

Correct answer is A

No explanation has been provided for this answer.

192.

\(^{226}_{88}Ra\) \(\to\) \(^{222}_{866}Rn\) + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?

A.

Alpha particle

B.

Beta particle

C.

Gamma ray

D.

Neutron

E.

X – ray

Correct answer is A

No explanation has been provided for this answer.

193.

A wire of length 100cm and cross-sectional area 2.0 × 10-3cm2 has a resistance of 0.10 ω. Calculate its electrical conductively.

A.

2.0 × 10-6 ω-1cm-1

B.

5.0 × 10-5 ω-1cm-1

C.

2.0 × 106 ω-1cm-1

D.

5.0 × 106 ω-1cm-1

E.

5.0 × 107 ω-1cm-1

Correct answer is B

No explanation has been provided for this answer.

195.

How much heat is required to convert 50g of water at 100°C to steam at the same temperature? (Specific latent heat of vaporization of water = 2260 Jg-11)

A.

1.13 × 10-4J

B.

1.31 × 102J

C.

1.30 × 104J

D.

1.13 × 105J

E.

1.31 × 106J

Correct answer is D

No explanation has been provided for this answer.