1992 - JAMB Physics Past Questions and Answers - page 3
21
A
7.2 x 10-4J
B
1.4 x 10-3J
C
1.4 x 10-3J
D
1.2 x 10-2J
correct option: a
Users' Answers & Comments22
A
Upwards
B
Downwards
C
TOwards The North Pole
D
Towards The South Pole
correct option: a
Users' Answers & Comments23
What is the least possible error in using a rule graduated in centimeters?
A
0.1cm
B
0.5cm
C
1.0cm
D
2.0cm
correct option: a
Users' Answers & Comments24
Which of the following affects the period of a simple pendulum? i. mass of the pendulum bob. ii. length of the pendulum. iii. acceleration due to gravity.
A
i, ii, and iii
B
ii and iii only
C
i and iii only
D
i and ii only
correct option: b
Users' Answers & Comments25
A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall
A
in front of his palm
B
behind his palm
C
beside his palm
D
into his palm
correct option: b
Users' Answers & Comments26
A body starts from rest and moves with uniform acceleration of 6ms-2. What distance does it cover in the third seconds
A
15m
B
18m
C
27m
D
30m
correct option: a
Users' Answers & Comments27
A stone, Q is thrown with velocity U at an angle of 75o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15o to the horizontal. The ranges covered by the stones will be
A
greater for Q
B
greater for R
C
the same for Q and R
D
greater for the heavier of the two stones
correct option: c
Range = \(\frac{U^2sin2\theta}{g}\)
RangeQ = \(\frac{U^2sin150}{g}\)
RangeR = \(\frac{U^2sin30}{g}\)
Since, sin30o = sin150o
therefore, RQ = RR
Users' Answers & CommentsRangeQ = \(\frac{U^2sin150}{g}\)
RangeR = \(\frac{U^2sin30}{g}\)
Since, sin30o = sin150o
therefore, RQ = RR
28
A man weight 800N climbs up a stairs to height of 15m in 12.5s. What is the man''s average power output?
A
667W
B
810W
C
960W
D
15000W
correct option: c
power = \(\frac{\text {work done}}{time}\)
= \(\frac{800 \times 15}{12.5}\)
= 960W
Users' Answers & Comments= \(\frac{800 \times 15}{12.5}\)
= 960W
29
A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the
A
80%
B
75%
C
50%
D
33%
30
In an experiment to determine Young's Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the
A
load and the extension
B
load and the radius of the wire
C
radius of the wire and the extension
D
extension and the original length of the wire
correct option: b
Users' Answers & Comments