Education

UTME Physics 1978 JAMB Past Questions and Answers, Jamb, Pre-degree, Nursing, Waec, Neco

UTME Physics 1978 JAMB Past Questions and Answers, Jamb, Pre-degree, Nursing, Waec, Neco

UTME Physics 1978 JAMB Past Questions and Answers

1. A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?

Advertisements

Options

A) 170ms-1

Register Your Business or Company Name With CAC

B) 136ms-1

C) 340ms-1

D) 680ms-1

E) 510ms-1

The correct answer is C.

Explanation:

Velocity = distancetimedistancetime

echo time = halt total time

= 1212 x 4 = 25

velocity = 68026802

= 340ms-1

2. An object 1cm high placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is

Options

A) 0.5cm

B) 1.5cm

C) 3cm

D) 2.5m

E) 2cm

The correct answer is E.

Explanation:

image distanceobject distanceimage distanceobject distance = image heightobject heightimage heightobject height

30153015 = image height1image height1

image height = 2cm

3. On an a.c generator, which of the following does not apply?

Options

A) field magnet

B) commutator

C) armature

D) slip rings

E) carbon brushes

The correct answer is B.

4. Why is it impossible for the lines of force of an electric field to cross one another?

Options

A) like charges repel each other

B) a charged particle is deflected by an eletric field

C) like charges are arranged on the same line of force

D) a positively charged particle can travel in only one direction at any time

E) none of these is correct

The correct answer is D.

5. A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is

Options

A) 4800 cal

B) 6000 cal

C) 2400J

D) 240k cal

E) 6000J

The correct answer is E.

Explanation:

Heat energy = Elect. energy = Ivt

= 5 x 6 x 200

= 6,000J

Pages: 1 2 3 4 5 6 7 8 9 10 11

Leave a Reply

Your email address will not be published.