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2023 - JAMB Physics Past Questions and Answers - page 2

11

 

An open-tube mercury manometer is used to measure the pressure in a gas tank. When the atmospheric pressure is 101,325 Pa, what is the absolute pressure in Pa in the tank if the height of the mercury in the open tube is 25 cm higher

A

108,986 Pa

B

165,238 Pa

C

122,364 Pa

D

134,645 Pa

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12

 

What is the name of the model of the atom that describes electrons as orbiting the nucleus in specific energy levels?

A

Bohr model

B

Dalton model

C

Rutherford model

D

Thomson model

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13

 

A missile is launched with a speed of 75 ms-1 at an angle of 22° above the surface of a warship. Find the horizontal range achieved by the missile. Ignore the effects of air resistance.

[Take g = 10 ms-1]

A

195

B

271 m

C

391 m

D

136 m

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14

 

Which of the following liquids has the highest surface tension?

A

Soapy water

B

Water

C

Mercury

D

Oil

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15

 

A parallel plate capacitor separated by an air gap is made of 0.8m2 tin plates and 20 mm apart. It is connected to 120 V battery. What is the charge on each plate?

Take εo = 8.85×1012Fm1

A

3.54nC

B

42.5nC

C

35.4nC

D

4.25nC

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16

 

Rainbow formation is as a result of the combination of which of the following phenomena?
(i) Reflection
(ii) Dispersion
(iii) Total internal reflection
(iv) Refraction

A

(ii) and (iv) only

B

(i), (iii) and (iv) only

C

(i), (ii) and (iv) only

D

(ii), (iii) and (iv) only

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17

 

The surface temperature of a swimming pool on a warm day is 25oC and the temperature at the bottom is 15oC. If the swimming pool has a surface area of 620 m2 and a depth of 1.5m. Find the rate at which energy is transferred by conduction from the surface to the bottom of the swimming pool.

[Thermal conductivity of water (k) = 0.6071 Wm-1K-1]
 

A

2.5kw

B

250kw

C

300kw

D

3.0kw

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18

 

A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?

A

20

B

250

C

200

D

500

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19

 

Which of the following materials is a good insulator?

A

Silver

B

Water

C

Rubber

D

Copper

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20

The property of wave shown in the diagram above is?
 

A
Diffraction
B
Refraction
C
Polarisation
D
Interference
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