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Question 1 of 20

1. Question

2 points

The scent from a jar of perfume opened in one corner of a room is picked up in another part of the room. The perfume moves through the air molecules.

Correct

Incorrect

Diffusion describe the movement of solute particles through a medium from a region of higher concentration to a region of lower concentration. Diffusion is fastest in gaseous because gas molecule have more kinetic energy than particles in solid and liquid state and the rate of diffusion of gases is affected by densities.

Question 2 of 20

2. Question

2 points

The boiling point of water does not depend on?

Correct

Incorrect

The boiling point is quantity independent. 1 litre of H20 has the same boiling point as 10 litre. The impurities alter the boiling point. It may increase or decrease boiling point depending on the nature of the impurities substance.

Water boil when the external atmospheric pressure equal to saturated vapour pressure.

Question 3 of 20

3. Question

2 points

A current of 2A flows through a water voltmeter. How long does it take to liberate 0.12g of hydrogen (e.c.e of hydrogen is 0.00001g / coul)

(FUTA POSTUTME)

Correct

Incorrect

M = Zlt

t = M / Zl

t = 0.12 / (0.00001 x 2)

t = 6000sec

t = 6000 / 60 = 100mins

Question 4 of 20

4. Question

2 points

When the length of the string of a simple pendulum is L its period is 0.5π seconds. The period when the length is increase to 4L will be?

(OAU POSTUTME)

Correct

Length L1 = L

Period T1 = 0.5π secs

T2= ?

T2 / T1 = (√L2 / L1)

T2 / 0.5π = (√4L / L)

T2 = √4 x 0.5π

T2 = 0.5 x 2

T2 = π

Incorrect

Length L1 = L

Period T1 = 0.5π secs

T2= ?

T2 / T1 = (√L2 / L1)

T2 / 0.5π = (√4L / L)

T2 = √4 x 0.5π

T2 = 0.5 x 2

T2 = π

Question 5 of 20

5. Question

2 points

A wire carrying a current of 10A and 2.5m in length is placed in a field of flux intensity 0.14T. What is the force in the wire if it is placed at 60 degree to the field?

(UNIBEN POSTUTME)

Correct

F = BI / sin thita

F = 0.14(10 x 2.5) x sin 60

F = 3.03N

Incorrect

F = BI / sin thita

F = 0.14(10 x 2.5) x sin 60

F = 3.03N

Question 6 of 20

6. Question

2 points

An entirely longitudinal wave is?

(AAU POSTUTME)

Correct

Longitudinal wave is parallel to the direction of propagation. Example is sound wave

Incorrect

Longitudinal wave is parallel to the direction of propagation. Example is sound wave

Question 7 of 20

7. Question

2 points

>A body is projected from the earth’s surface with the hope of letting it escape from the earth’s gravitational field. What is the minimum escape velocity?

(OAU POSTUTME)

Correct

Ve = √(2gr)

Ve = √(2 x 9.8 x10^-3 x 6.4 x 10^3)

Ve = 11.2kms^-1

Incorrect

Ve = √(2gr)

Ve = √(2 x 9.8 x10^-3 x 6.4 x 10^3)

Ve = 11.2kms^-1

Question 8 of 20

8. Question

2 points

To what height will a missile find vertically upwards with a speed of 28m/s attain if air resistance is neglected? g = 09.8m/s

(LAUTECH POSTUTME)

Correct

V^2 = U^2 + 2as

28^2 = 0 + 2(9.8) x s

s = 40m

Incorrect

V^2 = U^2 + 2as

28^2 = 0 + 2(9.8) x s

s = 40m

Question 9 of 20

9. Question

2 points

Which of following is a measurement taken with venier calipers?

(UI POSTUTME)

Correct

Incorrect

Question 10 of 20

10. Question

2 points

A body of mass 1.5kg is fastened to a spring, and lie on a horizontal frictionless table. When the mass is pulled with a force of 32N, the extension in the spring is 0.35m. Calculate the maximum kinetic energy for a simple harmonic oscillation when the initial displacement is 0.2m?

(OAU POSTUTME)

Correct

F = 32

M = 1.5kg

e = 0.35m

Force constant, K =32 / 0.35 = 91.43 N / m

w = (√k/m)

w = (√91.32 / 1.5)

w = 7.807

K.E = 1 / 2 x m x w^2 x r^2

K.E = 1 / 2 x 1.5 x (7.807)^2 x (0.2)^2

K.E = 1.828J

Incorrect

F = 32

M = 1.5kg

e = 0.35m

Force constant, K =32 / 0.35 = 91.43 N / m

w = (√k/m)

w = (√91.32 / 1.5)

w = 7.807

K.E = 1 / 2 x m x w^2 x r^2

K.E = 1 / 2 x 1.5 x (7.807)^2 x (0.2)^2

K.E = 1.828J

Question 11 of 20

11. Question

2 points

A negative electric charge may be produced in the laboratory by rubbing?

(EKITI STATE UNIVERSITY)

Correct

Incorrect

Question 12 of 20

12. Question

2 points

Which of the following instruments is used to measure relative humidity?

(UNIBEN POSTUTME)

Correct

Incorrect

Question 13 of 20

13. Question

2 points

A change of temperature of 45°C is equivalent to change in temperature on Kelvin scale of?

(UNIBEN POSTUTME)

Correct

K = (°C + 273)

K = 45 + 273 = 308K

Incorrect

K = (°C + 273)

K = 45 + 273 = 308K

Question 14 of 20

14. Question

2 points

20mJ work is done in moving a 5 micro C of electric charges between two points in an electric field. Calculate the potential difference between the two points?

(UNILAG POSTUTME)

Correct

W = 1 / 2 (CV)^1/2

V = [2W / C]^1/2

V = √[(2 x 20 x 10^-3) / (5 x 10^-6)]

V = 89.4V

Incorrect

W = 1 / 2 (CV)^1/2

V = [2W / C]^1/2

V = √[(2 x 20 x 10^-3) / (5 x 10^-6)]

V = 89.4V

Question 15 of 20

15. Question

2 points

A motor car moves with a velocity of 20m/s on a rough horizontal road and covers a displacement of 50m. Find the coefficient of dynamic friction between the type of the ground (g = 10)

(UI POSTUTME)

Correct

v = 20m/s

s = 50m

V^2 = U^2 + 2as

20^2 = 0 + 2a(50)

a = 4ms^-2

As the vehicle tyre slide with the road surface

F = Frictional force = coefficient force

coefficient = a /g

4/10 = 0.4

Incorrect

v = 20m/s

s = 50m

V^2 = U^2 + 2as

20^2 = 0 + 2a(50)

a = 4ms^-2

As the vehicle tyre slide with the road surface

F = Frictional force = coefficient force

coefficient = a /g

4/10 = 0.4

Question 16 of 20

16. Question

2 points

Which of the following is not an application of total internal reflection?

(OAU POSTUTME)

Correct

Incorrect

Question 17 of 20

17. Question

2 points

A machine has a velocity ratio of 6 and is 80% efficient. The effort needed to lift a load of 30N wit aid of the machine is?
(FUTA POSTUTME)

Correct

Efficiency = L / E x 1 / V.R

80 / 100 = (300 / E) x 1 / 6

E = 300 / (0.8 x 6)

E = 62.5N

Incorrect

Efficiency = L / E x 1 / V.R

80 / 100 = (300 / E) x 1 / 6

E = 300 / (0.8 x 6)

E = 62.5N

Question 18 of 20

18. Question

2 points

A ball is projected from the ground at an angle of 30° with the horizontal at an initial speed of 40m/s ignoring air friction, calculate the time it will take the ball to strike the ground? (g = 10)

(AAU POSTUTME)

Correct

The time it takes to strike the ground, the total time of travel

t = u x sin30° / g

Total time it travel

2t = u x sin30° / g

t = 2 x 40 sin 30° / 10

t = 4s

Incorrect

The time it takes to strike the ground, the total time of travel

t = u x sin30° / g

Total time it travel

2t = u x sin30° / g

t = 2 x 40 sin 30° / 10

t = 4s

Question 19 of 20

19. Question

2 points

An induction coil is generally used to?

(YABA COLLEGE OF TECHNOLOGY)

Correct

An induction coil is a device for developing high voltage, of order 10,000 to 100,000 volts from low voltage of DC source

Incorrect

An induction coil is a device for developing high voltage, of order 10,000 to 100,000 volts from low voltage of DC source

Question 20 of 20

20. Question

2 points

A stone thrown upward has acceleration that is?

(AAU POSTUTME)

Correct

Stone thrown upward move against air resistance require higher acceleration to move upward

Incorrect

Stone thrown upward move against air resistance require higher acceleration to move upward

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