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185 questions

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Question 51

jamb 2024

I It wets glass

II It needs to be coloured

III It has a low density

Water is not suitable for use as a thermometric liquid because

AI only

BI and II only

CI, II, and III only

DII and III only

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Question 52

jamb 2024

The quantity of heat required to melt ice of 0.2 kg whose specific latent heat is 3.4 x 10\(^5\)J/Kg is

A6.8 x 10\(^4\)J

B8.6 x 10\(^4\)J

C1.7 x 10\(^5\)J

D1.7 x 10\(^6\)J

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Question 53

jamb 2024

In a Hare's apparatus, the height of water and a liquid X are 0.3m and 0.5m respectively. The relative density of x is?

A0.4

B0.6

C1.7

D2.0

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Question 54

jamb 2024

An object is placed 25cm in front of a convex mirror has its image formed 5cm behind the mirror. what is the focal length of the convex mirror

A8.20cm

B6.25cm

C5.60cm

D4.50cm

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Question 55

jamb 2024

The value of R in the above circuit to make the galvanometer measure 2A is

A0.128\(\Omega\)

B0.256\(\Omega\)

C0.612\(\Omega\)

D1.00\(\Omega\)

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Question 56

jamb 2024

The capacitance of a capacitor, C, is inversely proportional to

Aarea of the plate

Bdielectric substance

Cdistance between plate

Ddirection of the plate

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Question 57

jamb 2024

Two tuning forks of frequencies 6Hz and 4Hz respectively are sounded together. The beat frequency is

A2Hz

B5Hz

C8Hz

D10Hz

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Question 58

jamb 2024

The tangential force acting on an object that opposes it from sliding freely on the adjacent surface is called

ANormal force

BFriction force

CWeight

DUpthrust

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Question 59

jamb 2024

The gravitational force between two objects masses 10\(^{24}\)kg and 10\(^{27}\)kg is 6.67N. Calculate the distance between them [ G = 6.6 x 10\(^{-11}\)Nm\(^2\)kg\(^{-2}\) ]

A1.0 x 10\(^{20}\)m

B2.0 x 10\(^{-20}\)m

C1.0 x 10\(^{-20}\)m

D2.0 x 10\(^{20}\)m

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Question 60

jamb 2024

What will be the weight of a man of mass 60kg standing in a lift if the lift is descending vertically at 3ms\(^2\)?

A780N

B546N

C660N

D420N

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Question 61

jamb 2024

Calculate the depth of a swimming pool if the apparent depth is 10cm. ( Refractive index of water = 1.33 )

A7.5cm

B10.0cm

C13.3cm

D6.87cm

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Question 62

jamb 2024

An ideal transformer has

AMaximum primary resistance

BNo flux leakage

CHysteresis

DEddy current

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Question 63

jamb 2024

The gravitational force between two objects is 10N, what is the new value of the force if the distance between them is halved?

A10N

B20N

C40N

D80N

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Question 64

jamb 2024

Using the diagram above, the effective force pushing it forward at an angle 60º is

A25.00N

B28.87N

C38.50N

D43.30N

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Question 65

jamb 2024

An electron falls from an energy level of -5.44eV to another energy level, E. If the emitted photon is of wavelength 5.68 x 10\(^{-6}\)m, calculate the energy change. [ Plank's c x 10\(^{-34}\)Js, emitted radiation speed = 3.0 x 10\(^8\)ms\(^{-1}\)]

A1.49 x 10\(^{-20}\)J

B1.49 x 10\(^{-19}\)J

C3.49 x 10\(^{-20}\)J

D3.49 x 10\(^{-19}\)J

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Question 66

jamb 2024

A red shirt under a red light appears pale because red

Areflects nearly all light falling on it

BUnable to reflect lights falling on it

Cabsorbs all lights falling on it

Dabsorbs other colours and reflects red

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Question 67

jamb 2024

Which of the following materials has a very large energy gap band?

AConductor

BInsulator

CSemiconductor

DIntrinsic semiconductor

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Question 68

jamb 2024

If the velocity ratio of a machine is 4, what does it mean?

ALoad and the effort are equal.

BDistance moved by effort is 4 times greater than the distance moved by load.

CThe efficiency is low

DThe load is greater than the effort

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Question 69

jamb 2024

A body is whirled in a horizontal circle at the rate of 800 revolutions per minute. Determine the angular velocity

A100\(\pi\)rads\(^{-1}\)

B33.3\(\pi\)rads\(^{-1}\)

C29.5\(\pi\)rads\(^{-1}\)

D26.7\(\pi\)rads\(^{-1}\)

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Question 70

jamb 2024

When a cell of e.m.f 3.06V is connected, the balance of a potentiometer is 75cm, Calculate the new balance of a cell of e.m.f 2.295V

A56.26cm

B73.20cm

C77.80cm

D78.70cm

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