"Position" question number distribution across years

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Physics index on skoool nigeria

WAEC questions for "Physics :: Position"

Q1

A block of volume 3 x 10^{-5} m^{3} and density 2.5 x 10^{3} kg m^{3} is suspended from a spring balance with 2/3 of its volume immersed ina liquid of density 900 kg m^{-3} . Determine the reading of the spring balance [g =10ms^{-2}]

A

0.18N

B

0.57N

C

0.75N

D

0.93N

E

**Answer:** B

Q2

Which of the following statements about a spring balance is not correct?

A

the chemical balance operates on the principle of moments

B

the spring balance operates on Hooke's law

C

either may be used to measure the weight of a substance

D

the reading of a spring balance changes over the surface of the earth, while that of the chemical balance remains constant

E

**Answer:** C

Q3

The diagram above represents the displacement d versus time t graph of a progressive wave. Deduce frequency of the wave.

A

20Hz

B

10Hz

C

5Hz

D

4 Hz

E

**Answer:** D

Q4

A reservoir is filled with a liquid of density 2000 kgm^{3}. Calculate the depth at which the pressure in the liquid will be equal to 9100 Nm^{-2}.

[ g= 10ms^{-2}]

A

0.262m

B

0.455m

C

0.664m

D

0.819m

E

**Answer:** B

Q5

A solid weighs 45N and 15N respectively in air and water. Determine the relative density of the solid.

A

0.33

B

0.50

C

1.50

D

3.00

E

**Answer:** C

Q6

A boy travels 8 km eastward to a point B and then 6km northward to another point C. Determine the difference between the magnitude of displacement of the boy and distance travelled by him.

A

2.0km

B

4.0km

C

10.0km

D

14.0km

E

**Answer:** B

Q7

The magnitude of the force required to make an object of mass m move with speed v in a circular path of radius r is given by expression :

A

mr

v

B

mr^{2}

v

C

mv^{2}

r

D

mv

r^{2}

E

**Answer:** C

Q8

A load of mass 120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100% . Calculate the power generated y the machine . [g= 10ms^{-2]}

A

60W

B

80W

C

100W

D

120W

E

**Answer:** B

Q9

A spring balance, which is suspended from the roof of a lift, carries a mass of 1 kg at its free end. If the lift accelerates upwards at 2.5m^{-2}, determine the reading on the spring balance. [g=10ms^{-2}]

A

25.0N

B

12.5N

C

7.5N

D

4.0N

E

**Answer:** C

Q10

An object of weight 10N immersed in a liquid displaces a quality of the liquid. If the liquid displaced weighs 6N , determine the upthrust on the object

A

20N

B

10N

C

6N

D

4N

E

**Answer:** C

Q11

The apparent weight of a body fully immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. [ Density of water = 1000 kg m^{-3} , g = 10ms^{-2}]

A

8.9 x 10^{-3} m^{3}

B

6.4 x 10^{-3} m^{3}

C

3.2 x 10^{-3} m^{3}

D

3.0 x 10^{-3} m^{3}

E

**Answer:** B

Q12

The diagram represents a section of a pair of vernier callipers. The reading on the instrument is

A

5.22cm

B

5.24cm

C

5.25cm

D

5.26cm

E

**Answer:** D

Q13

An iron rod is moved from earth to the moon. Which of the following properties of rod would remain unchanged?

I. Mass

II. Weight

III. Relative density

A

I only

B

II only

C

III only

D

I and III only

E

**Answer:** A

Q14

A uniform cylindrical hydrometer of mass 20g and cross sectional area 0.54cm^{2} floats upright in a liquid. If 25cm of its lenght is submerged, calculate the relative density of the liquid. [Density of water = 1g cm^{-3} ]

A

1.54

B

1.48

C

1.25

D

0.80

E

**Answer:** B

Q15

The apparent weight of a body wholly immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body .

[ Density of water = 1000gm^{-3} , g =10ms^{-2}]

A

8.9 x 10^{-3} m^{3}

B

6.4 x 10^{-3} m^{3}

C

3.2 x 10^{-3} m^{3}

D

3.0 x 10^{-3} m^{3}

E

**Answer:** B

Q16

The diagram illustrate the velocity-time graph of the motion of a body. Calculate the total distance covered by the body.

A

50m

B

65m

C

175m

D

225m

E

300m

**Answer:** D

Q17

A body of mass 4.2 kg moving with velocity 10ms^{-1} due east, hits a stationary body of mass 2.8kg. If the stick together after collision and move velocity V due east, calculate the value of V

A

3ms^{-1}

B

6 ms^{-1}

C

7 ms^{-1}

D

15 ms^{-1}

E

17 ms^{-1}

**Answer:** B

Q18

A car traveling at a uniform speed of 120 km h^{-1} passes two stations in 4 meters . Calculate the distance between the two stations

A

8 km

B

15 km

C

22 km

D

30 km

E

60 km

**Answer:** A

Q19

The diagram represents the velocity time graph of a body in motion . The total distance travelled by the body is 195 m. Calculate the accleration of the body in section OP of the graph.

A

1.0 ms^{-2}

B

2.5ms^{-2}

C

7.8 ms^{-2}

D

9.3ms^{-2}

E

19.5^{-2}

**Answer:** B

Q20

The density of water is 1 g cm^{-3} while that of ice is 0.9 cm^{-3} . Calculate the change in volume when 90 g of ice is completely melted

A

0 cm^{3}

B

9 cm^{3}

C

10 cm^{3}

D

90cm^{3}

E

100cm^{3}

**Answer:** C

Q22

A boatman facing north wants to cross a flowing river to a point directly opposite its positin at the bank. If the river is flowing eastwards, in what direction should the row his boat?

A

West

B

East

C

North-west

D

North-east

E

South-west

**Answer:** C

Q23

Which of the units of the following physical quantities are derived? I Area II Thrust III Presure IV Mass

A

I, II, III, IV

B

I, II, III only

C

I, II, IV only

D

I and III only

E

I and IV only

**Answer:** B

Q24

When three coplanar non-parallel forces are in equilibrium, I they can be represented in magnitude and direction by the three sides of the triangle taken in order II their lines of action meet at a point III the magnitude of any one force equals the magnitude of resultant of the other two. IV any one force is the equilibrant of the other two Which of the statements above are correct?

A

I and II only

B

II and III only

C

II, III and IV only

D

I, II, III and IV

E

I, III and IV only

**Answer:** B

Q25

This diagram represents a portion of a vernier calliper. What is its reading?

A

7.10cm

B

7.09cm

C

6.90cm

D

6.34cm

E

6.29cm

**Answer:** E