NECO Physics Past Questions & Answers - Page 20

96.

Mercury does NOT wet glass because

A.

glass is an amorphous substance

B.

the adhesive force is greater than the cohesive force

C.

the cohesive force is greater than the adhesive force.

D.

mercury has very high thermal conductivity

E.

mercury is opaque.

Correct answer is C

No explanation has been provided for this answer.

97.

When a yellow card is viewed in blue light, It will appear

A.

black

B.

orange

C.

purple

D.

red

E.

white

Correct answer is A

Yellow does not contain blue, so it will appear black under blue light

100.

Calculate the magnitude of the force due to a magnetic field of 0.40T on an electron moving perpendicular to the field with a speed of 4.00 × 106ms-1 (e 1.60 × 10-19C]

A.

6.40 × -10

B.

6.40× 10-13N

C.

2.56 × 10-13N

D.

1.60 × 10-12N

E.

2.30 × 10-11N

Correct answer is C

No explanation has been provided for this answer.