Jamb Mathematics

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1. If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?

4.8g

2.4g

3.2g

4.2g

2. What effort will a machine of efficiency 90% applyWhat effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?

80N

90N

100N

120N

3. Capacitors are used in the induction coil to

prevent distortion of electric fields

control circuits

dissipate energy

prevent electric sparks

4. A wave that travels through stretched strings is known as

seismic wave

electromagnetic wave

micro wave

mechanical wave

5. The pair if physical quantities that are scalar only are

Impulse and time

Volume and area

Moment and momentum

Length and displacement

6. Calculate the energy of the third level of an atom if the ground state energy is -24.8eV

-1.75eV

-9.20eV

-8.20eV

-2.75eV

7. An electric device is rated 2000W, 250V. Calculate the maximum current it can take.

8. The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is

diffusion

convection

conduction

radiation

9. At what height must a similar body be situated to have potential energy equalAn object is moving with a velocity of 5ms-1. At what height must a similar body be situated to have potential energy equal in value with the kinetic energy of the moving body?

[g = 10ms-2]

1.0m

25.0m

20.0m

1.3m

10. What will happen to the boiling point of pure water when it is heated in a place 30m below the sea love?

It will be fluctuating

It will be more than 100 degree C

It will be less than 100 degree C

It will still be at 100 degree C

11. A gas at a pressure of 105Nm-2 expands from 0.6m3 to 1.2m3 at constant temperature, the work done is

6.0 x 104 J

7.0 x 107 J

6.0 x 106 J

6.0 x 105 J

12. Calculate the apparent weight loss of a man...Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2.

105N

686N

595N

581N

13. Two liquids X and Y having the same mass are supplied with the same quantity of heatTwo liquids X and Y having the same mass
are supplied with the same quantity of
heat. If the temperature rise in X is twice
that of Y, the ratio of specific heat
capacity of X to that of Y is

1 : 4

2 : 1

1 : 2

4 : 1

14. When a brick is taken from the earth's surface to the moon, its mass

Becomes zero

Remains constant

Reduces

Increases

15. Calculate the force acting on an electron of charge 1.5 x 10-19C placed in an electric field of intensity 105 Vm-1

1.5 x 10-14N

1.5 x 10-11N

1.5 x 10-12N

1.5 x 10-13N

16. A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?

1.00m

0.05m

0.15m

0.30m

17. What fraction of its volume will be immersed in the liquid?A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid?

[density of the cork = 0.25 x 103 kgm-3 Density of the liquid = 1.25 x 103 kgm-3]

0.1

0.8

0.5

0.2

18. The time required to bring the train to a complete halt isA train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2ms-2. The time required to bring the train to a complete halt is

40s

10s

20s

19. If a sonometer has a fundamental frequency of 450Hz, what is the frequency of the fifth overtone?

75Hz

2700Hz

456Hz

444Hz

20. At what depth below the sea-level would one experience a change of pressure equal to one atmosphere?

100.0 m

0.1 m

1.0 m

10.0 m

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