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JAMB PRACTICE FRIDAY JUNE 4

Total questions: 40

Worksheet time: 30mins

Name
Class
Date
1.

How can energy loss be minimized through Eddy-current?

a)

By using high resistance wire

b)

By using insulated soft iron wires

c)

By using low resistance wires

d)

By using turns of wires

2.

From the diagram above, calculate the energy stored in the capacitor

a)

4.0×10−2 J4.0\times10^{-2}\ J

b)

4.0×10−4 J4.0\times10^{-4}\ J

c)

8.0×10−4 J8.0\times10^{-4}\ J

d)

8.0×10−2 J8.0\times10^{-2}\ J

3.

Which of the following operations can be used to convert an alternating current dynamo into a direct current dynamo

a)

number of turns in the coil is increased

b)

strength of the field magnet is increased

c)

slip rings are replaced with split ring commutator

d)

coil is wound on a soft iron armature

4.

The net capacitance in the circuit above is

a)

8.0 µF

b)

6.0 µF

c)

4.0 µF

d)

2.0µF

5.

The instrument used to measure the pressure of a gas is

a)

barometer

b)

thermometer

c)

hygrometer

d)

manometer

6.

A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms−2

the power expended is

a)

100 W

b)

200 W

c)

400 W

d)

500 W

7.

A radio station broadcast at a frequency of 600KHZ. If the speed of light in air is 3 × 108 ms−1. Calculate the wavelength of the radio wave

a)

2.20 × 103 m

b)

5.0 × 102 m

c)

5.0 × 105 m

d)

11.8 × 1011 m

8.

The S.I unit of moment of a force is

a)

Nm

b)

kgms-1

c)

Nm-1

d)

Jm

9.

A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine

a)

80.0%

b)

76.6%

c)

66.7%

d)

60.7%

10.

Calculate the height of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high

a)

10 cm

b)

16 cm

c)

5 cm

d)

14 cm

11.

When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity pf P to Q is

a)

1:4

b)

4:1

c)

1:1

d)

2:1

12.

When the r.m.s value of a source of electricity supply is given as 240 V, it means that the peak value of the supply is

a)

240 V

b)

340 V

c)

480 V

d)

57600 V

13.

Three 3 Ω resistance are connected in parallel what is the equivalent resistance?

a)

1 Ω

b)

9 Ω

c)

3 Ω

d)

0.33 Ω

14.

Which of the following instruments helps to maintain the correct humidity and temperature of a building?

a)

A compressor

b)

A refrigerator

c)

Air blower

d)

Air conditioner

15.

An element and its isotope only differ in the number of

a)

protons

b)

electrons

c)

ions

d)

neutrons

16.

Under what conditions are cathode rays produced in a discharge tube?

a)

High pressure and low voltage

b)

High pressure and high voltage

c)

Low pressure and low voltage

d)

Low pressure and high volatge

17.

Under which of the following conditions is work done?

a)

A man supports a heavy food above his head with his hands

b)

A boy climbs onto a table

c)

A man pushes unto a table

d)

A woman holds a pot of water

18.

Calculate the specific latent heat of vaporization of steam of 1.13 x 106J of heat energy is required to convert 15kg of it to water.

a)

7.53 x 105 Jkg−1

b)

7.53 x 10-2 Jkg−1

c)

7.53 x 104 Jkg−1

d)

7.53 x 10-3 Jkg−1

19.

A cell of internal resistance 2 Ω supplies current to a 6 Ω resistor. The efficiency of the cell is

a)

12.0%

b)

25.0%

c)

33.3%

d)

75.0%

20.

Which of the following statements is NOT correct?

a)

Molecules of a liquid are stationary

b)

Brownian motion is an evidence of particle nature of matter

c)

Matter is made up of molecules

d)

The molecules of matter are in constant motion

21.

Which is the incorrect formula for a body accelerating uniformly?

a)

v2=u2+2asv^2=u^2+2as

b)

a=v2−u22sa=\frac{v^2-u^2}{2s}

c)

s=12ut+at2s=\frac{1}{2}ut+at^2

d)

v2−u2=2asv^2-u^2=2as

22.

Which of the following is not an electromagnetic radiation?

a)

X-ray

b)

Radio waves

c)

Sunlight

d)

Sound waves

23.

Calculate the electric field intensity between two plates of potential difference 6.5V when separated by a distance of 35cm.

a)

18.57 NC−1

b)

53.06 NC−1

c)

2.28 NC−1

d)

0.08 NC−1

24.

Why do soldiers march disorderly while crossing a bridge?

a)

To prevent resonance on the bridge

b)

To set the bridge into resonance

c)

To make the bridge collapse

d)

To spread their weight evenly on the bridge

25.

Calculate the upthrust on an object of volume 50 cm3 which is immersed in liquid of density 103 kgm-3 [g = 10 ms-2]

a)

0.8 N

b)

2.5 N

c)

0.5 N

d)

1.0 N

26.

Calculate the time taken for a mango fruit that falls from the tree 20 m to the ground [g = 10 ms-2]

a)

10 s

b)

5 s

c)

4 s

d)

2 s

27.

The velocity ratio of an inclined plane where angle of inclination in θ is

a)

sin θ

b)

cos θ

c)

tan θ

d)

1sin⁡θ\frac{1}{\sinθ}

28.

The volume of a fixed mass of gas is 10cm3 when its pressure is 400cmHg. Determine the volume of the gas when its pressure is 200cmHg.

a)

30 cm3

b)

40 cm3

c)

50 cm3

d)

20 cm3

29.

If silicon is doped with phosphorus, what type of semiconductor material will be formed?

a)

Zener material

b)

p-n junction

c)

n-type

d)

p-type

30.

Calculate the angle of minimum deviation of a 60o prism of a refractive index [sin-1(0.75) = 49o]

a)

38.00o

b)

19.47o

c)

16.25o

d)

49.00o

31.

What is the cost of running seven 40 W lamps and five 80 W lamps for 12 hours of the electrical energy cost N7.00kWh?

a)

N80.00

b)

N 45.36

c)

N 65.00

d)

N 57.12

32.

From the diagram above, calculate the total current in the circuit

a)

5.0 A

b)

3.7 A

c)

4.5 A

d)

4.0 A

33.

Which of the following surfaces will absorb radiant heat energy best?

a)

White

b)

Red

c)

Black

d)

Blue

34.

It is known that a neutron exists in a light atomic nucleus

Which of the following also exists in the nucleus?

a)

An electron

b)

A β - particle

c)

Proton

d)

An α - particle

35.

The instrument to measure the relative density of light is

a)

thermometer

b)

hydrometer

c)

spring balance

d)

beaker

36.

What is the speed of a body vibrating at 50 cyclic per second?

a)

100 π rads−1

b)

200 π rads−1

c)

50 π rads−1

d)

400 π rads−1

37.

The action of blotting paper on ink is due to

a)

diffusion

b)

osmosis

c)

capillarity

d)

surface tension

38.

I. Refraction II. Interference III. Diffraction

Which of the above properties are common to all waves?

a)

II and III only

b)

I, II and III

c)

I and II only

d)

I and III only

39.

A constant force of 5 N acts for 5 seconds on a body of mass 5 kg initially at rest. Calculate the final momentum

a)

125 kgms-1

b)

25 kgms-1

c)

15 kgms-1

d)

0 kgms-1

40.

Which of the following is a semiconductor?

a)

copper

b)

silicon

c)

plastic

d)

iron

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