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154 questions

Question 1 of 20 154 total questions

Question 61

jamb 2025

A wooden block of relative density 0.4 floats in a liquid of density 1600 kg m\(^{-3}\). What fraction of its volume is immersed?

A0.15

B0.10

C0.25

D0.20

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Question 62

jamb 2025

A machine has an efficiency of 80%. If the input work is 200J, the output work is?

A250J

B160J

C120J

D100J

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Question 63

jamb 2025

What magnitude of electric current can store 2.5 J of energy in a 3 H induction coil?

A1.29 A

B2.48 A

C5.00 A

D3.66 A

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Question 64

jamb 2025

What form of energy is present in the food we eat?

AKinetic

BMechanical

CPotential

DChemical

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Question 65

jamb 2025

The figure shows a uniform metre rule of weight 100 N balanced by a knife edge at the 10 cm mark and a cord attached at the 85 cm mark. What is the tension in the string?

A23.62 N

B53.33 N

C35.74 N

D78.68 N

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Question 66

jamb 2025

How long will it take to heat 4 kg of water from 30ºC to 65ºC using an electric kettle taking 5 A from a 240 V supply?
(Specific heat capacity of water = 4200 J kg\(^{-1}\) K\(^{-1}\))

A160 s

B245 s

C490 s

D150 s

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Question 67

jamb 2025

Calculate the decay constant of a radioactive isotope of half-life 138.5 s.

A5.0 × 10\(^{-3}\) s\(^{-1}\)

B5.1 × 10\(^{-3}\) s\(^{-1}\)

C4.9 × 10\(^{-3}\) s\(^{-1}\)

D5.2 × 10\(^{-3}\) s\(^{-1}\)

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Question 68

jamb 2025

The device that operates using the magnetic effect of electric current is

ARheostat

BThermostat

CElectric bell

DCarbon microphone

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Question 69

jamb 2025

The volume of a fixed mass of gas at 0º C is 200 m\(^3\). What is its volume at 273º C at constant pressure?

A100 m\(^3\)

B400 m\(^3\)

C800 m\(^3\)

D200 m\(^3\)

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Question 70

jamb 2025

If the critical angle for a glass–air boundary is 45º, what is the refractive index of the glass?

A\(\sqrt{2}\)

B\(\sqrt{5}\)

C\(\sqrt{3}\)

D2\(\sqrt{2}\)

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Question 71

jamb 2025

Charge carriers in doped semiconductors are

Aelectrons and protons

Belectrons and neutrons

Canions and cations

Delectrons and holes

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Question 72

jamb 2025

5400kJ of heat energy was lost when some amount of steam condensed to water for drinking purposes at 15º C. What is the quantity of water collected? [L\(_f \) = 2.26 × 10\(^6\) Jkg\(^{-1}\), c\(_w\) = 4200 Jkg\(^{-1}K^{-1}\)]

A0.95 kg

B8.24 kg

C1.84 kg

D2.06 kg

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Question 73

jamb 2025

Which of the following has the least thermal conductivity?

Aair

Bash

Cglass

Dwater

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Question 74

jamb 2025

Without considering the containing vessel, what mass of boiled water can raise the temperature of 8 kg of water from 25°C to 60°C when mixed in a heat-proof container?

A10kg

B7kg

C5kg

D6kg

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Question 75

jamb 2025

A boy uses a single string pulley system to lift a mass of 20kg moving with a velocity of 5ms\(^{-1}\). What is the power developed by the boy if g = 10ms\(^{-2}\)?

A100W

B1000W

C250W

D40W

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Question 76

jamb 2025

For a gas, which pair of variables is inversely proportional to each other (provided other conditions are constant), where P = pressure, T= temperature, V= volume, and n= number of molecules?

AP, T

BP, V

Cn, P

DV, T

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Question 77

jamb 2025

The volume of a 1 cm\(^3\) metal ball increases by 0.0018 cm\(^3\) when heated through temperature θ. If the linear expansivity of the ball is 2.0 x 10\(^{-5} K^{-1}\), find θ.

A20°C

B50°C

C30°C

D25°C

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Question 78

jamb 2025

The gravitational pull between two bodies is 20N. Find the gravitational pull when their distance of separation is doubled.

A10N

B5N

C13N

D20N

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Question 79

jamb 2025

A hydraulic press consists of two cylinders of cross-sectional radius r\(_1\) and r\(_2\). If a force of 200N applied to the smaller piston (r\(_1\)), causes a force of 3200N to be transmitted onto the larger piston (r\(_2\)). The ratio r\(_1\): r\(_2\) is?

A1:4

B1:2

C1:8

D1:16

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Question 80

jamb 2025

A 500W electric oven plugged into a 220 V source will consume an electric current of

A4.88A

B2.27A

C6.43A

D3.23A

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