JAMB Physics 2001

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JAMB Physics 2001

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1 / 45

A working electric motor takes a current
of 1.5A when the p.d. across it is 250V.
If its efficiency is 80%, the power output
is

2 / 45

Which of the following metals will
provide the greatest shield against
ionizing radiation?

3 / 45

A stone of mass 1kg is dropped from a
height of 10m above the ground and
falls freely under gravity. Its kinetic
energy 5m above the ground is then
equal to

4 / 45

The cost of running five 6W lamps and
four 100W lamps for 20 hours if
electrical energy costs N10.00 per KWh
is

5 / 45

A gas with initial volume 2 x 10-6m
3
is
allowed to expand to six times its initial
volume at constant pressure of
2 x 10-5Nm-2

. The work done is

6 / 45

In a Daniel Cell, the depolarizer, positive
and negative electrodes are
respectively

7 / 45

In the circuit diagram above, the
ammeter reads a current of 3A when R
is 5Ω and 6A when R is 2Ω. Determine
the value of x.

8 / 45

In the diagram above, the current I is

9 / 45

If a spherical metal bob of radius 3cm is
fully immersed in a cylinder containing
water and the water level rises by 1cm,
what is the radius of the cylinder?

10 / 45

In the diagram above, determine the
r.m.s. current.

11 / 45

A string is fastened tightly between two
walls 24cm apart. The wavelength of
the second overtone is

12 / 45

Ice cubes are added to a glass of warm
water. The glass and water are cooled
by

13 / 45

The diagram above shows a closed
square box of side 0.5m in a uniform
electric field E in the direction shown by
the arrows. What is the flux  for the
box?

14 / 45

When a piece of rectangular glass block
is inserted between two parallel plate
capacitors, at constant plate area and
distance of separation, the capacitance
of the capacitor will

15 / 45

The force on a current carrying
conductor in a magnetic field is
greatest when the

16 / 45

A cell of internal resistance r supplies
current to a 6.0 resistor and its
efficiency 75%, find the value of r.

17 / 45

In the diagram above, which of the
simple pendula will resonate with P
when set into oscillation?

18 / 45

A ray of light strikes a plane mirror at an
angle of incidence of 35o

. If the mirror is

rotated through 10o

, through what
angle is the reflected ray rotated?

19 / 45

The process of energy production in the
sun is

20 / 45

the driving mirror of a car has a radius
of curvature of 1m. A vehicle behind the
car is 4m from the mirror. Find the
image distance behind the mirror.

21 / 45

A resistance R is connected across the
terminal of an electric cell of internal
resistance 2 and the voltage was
reduced to
5
3
of its nominal value. The

value of R is

22 / 45

The efficiency of a machine is always
less than 100% because the

23 / 45

Which of the following consists entirely
vector quantities?

24 / 45

I. The earth is not spherical but

elliptical in shape.
II. Variation in latitude and
longitude.
III. Rotation of the earth on its axis.
IV. Variation in the density of the
earth.
On which combination of the above
does the weight of an object vary on
the earth’s surface?

25 / 45

The diagram shows three capacitors C1,
C2 and C3 of capacitances 2F, 6F and
3F respectively. The potential
differences across C1, C2 and C3
respectively are

26 / 45

Energy losses through eddy currents are
reduced by using

27 / 45

What is the angle of dip at the magnetic
equator?

28 / 45

At resonance, the phase angle in an a.c.
circuit is

29 / 45

The particle emitted when K
39
19 decays

to K
39
19 is

30 / 45

A student is at a height 4m above the
ground during a thunderstorm. Given
that the potential difference between
the thunderstorm and the ground is
107
V, the electric field created by the
storm is

31 / 45

I. Low pressure.
II. High pressure.
III. High p.d.
IV. Low p.d.
Which combination of the above is true
of the conduction of electricity through
gases?

32 / 45

The thermometric substance of an
absolute thermometer is

33 / 45

A bread toaster uses a current of 4A
when plugged in a 240 volts line. It
takes one minute to toast slices of
bread. What is the energy consumed by
the toaster?

34 / 45

A cell can supply currents of 0.4A and
0.2A through a 4.0Ω and 10.0Ω
resistors respectively. The internal
resistance of the cell is

35 / 45

A plane sound wave of frequency
85.5Hz and velocity 342ms-1

is reflected
from a vertical wall. At what distance
from the wall does the wave have an
antinode?

36 / 45

The resultant of two forces acting on an
object is maximum if the angle between
them is

37 / 45

Find the frequencies of the first three
harmonics of a piano string of length
1.5m, if the velocity of the waves on the
string is 120ms-1

38 / 45

The diagram below is a block-and-tackle
pulley system in which an effort of 80N
is used to lift a load of 240N. The
efficiency of the machine is

39 / 45

The primary coil of a transformer has N
turns and is connected to a 120V a.c.
power line. If the secondary coil has
1000 turns and a terminal voltage of
1200 volts, what is the value of N?

40 / 45

The diagram above shows two
capacitors P and Q and capacitances
2F and 4F respectively connected to
a d.c. source. The ratio of energy stored
in P to Q is

41 / 45

The terrestrial telescope has one extra
lens more than the astronomical
telescope. The extra lens is for

42 / 45

The magnetic force on a charged
particle moving with velocity v is

43 / 45

The height at which the atmosphere
ceases to exist is about 80km. If the
atmospheric pressure on the ground
level is 760mmHg, the pressure at a
height of 20km above the ground level
is

44 / 45

A transistor functions mainly as a

45 / 45

The pressure of a given mass of a gas
changes from 300Nm-2

to 120Nm-2
while the temperature drops from
127o
C to –73o
C. The ratio of the final
volume to the initial volume is

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