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40 questions

Question 1 of 20 40 total questions

Question 11

jamb 2021

Particles of mass 10\(^{-2}\)kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad\(^{-1}\). If the radius of the blade is 0.2m, the centripetal force is?

A2N

B20N

C200N

D400N

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Question 12

jamb 2021

Two bodies have masses in the ratio3:1. They experience forces which impart to them, acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced

A1:4

B2:1

C2:3

D2:5

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Question 13

jamb 2021

The inner diameter of a test tube can be measured accurately using a?

Amicrometer screw gauge

Bpair of dividers

Cmeter rule

Dpair of vernier calipers

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Question 14

jamb 2021

A certain radioactive source emits radiation that was found to be deflected by both magnetic and electric fields. The radiation is?

Abeta rays

Bgamma rays

Cx-rays

Dultra-violet rays

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Question 15

jamb 2021

If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?

A24 years

B20 years

C10 years

D2 years

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Question 16

jamb 2021

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?

[e = 1.6 x 10\(^{-19}\)J, h = 6.63 x 10-\(^{34}\)Js]

A6630.0V

B663.0V

C66.3V

D6.6V

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Question 17

jamb 2021

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductors are 30V and 40V respectively. What is the voltage across the capacitor?

A30V

B40V

C50V

D70V

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Question 18

jamb 2021

Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg\(^{-1}\)k\(^{-1}\) (specific latent heat of vaporization of water is 2260jg\(^{-1}\)

A530000J

B23200J

C17200J

D130000J

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Question 19

jamb 2021

Which of the following is not a vector quantity?

Amomentum

Bforce

Ctemperature

Ddisplacement

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Question 20

jamb 2021

A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms\(^{-1}\), how far is he from the cliff?

A680m

B170m

C34m

D85m

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Question 21

jamb 2021

A source of sound produces waves in air of wavelength 1.65m. If the speed of sound in air is 330ms\(^{-1}\), the period of vibration in air is?

A200

B0.005

C0.5

D0.02

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Question 22

jamb 2021

Which of the following instruments may be used to measure relative humidity?

AHydrometer

BManometer

CHygrometer

DHypsometer

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Question 23

jamb 2021

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg\(^{1}\) Cº. Calculate the specific latent heat of fusion of ice.

A9.0kjkg\(^{-1}\)

B84.0kjkg\(^{-1}\)

C134.0kjkg\(^{-1}\)

D168.0kjkg\(^{-1}\)

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Question 24

jamb 2021

A given mass of gas has a pressure of 80 Nm\(^{-2}\) at a temperature of 47 C. If the temperature is reduced to 27 C with volume remaining constant, the new pressure is?

A46.0 Nm\(^{-2}\)

B75.0 Nm\(^{-2}\)

C80.0 Nm\(^{-2}\)

D85.3 Nm\(^{-2}\)

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Question 25

jamb 2021

Which of the following is not correct about the molecules of a substance in a gaseous state. They?

Aare in a constant state of motion

Bhave different speeds

Chave a temperature which is measured by the average kinetic energy

DThe collision between the gases is perfectly inelastic

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Question 26

jamb 2021

The motion of a body is simple harmonic if the?

Aacceleration is always directed towards a fixed point

Bpath of motion is a straight line

Cacceleration is proportional to the square of the distance from a fixed point

Dacceleration is constant and directed towards a fixed point

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Question 27

jamb 2021

A ball of mass 0.5kg moving at 10ms\(^{-1}\) collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

A0.2ms\(^{-1}\)

B0.5ms\(^{-1}\)

C5.0ms\(^{-1}\)

D5.5ms\(^{-1}\)

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Question 28

jamb 2021

Which of the units of the following physical quantities are derived?

I. Area
II. Thrust
III. Pressure
IV. Mass

AI, II, III and IV

BI, II, and III only

CI, II, and IV only

DI and IV only

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Question 29

jamb 2021

A man will exert the greatest pressure when he?

Alies flat on his back

Blies on his belly

Cstands on both feet

Dstands on the toes of one foot

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Question 30

jamb 2021

The slope of the straight line displacement-time graph indicates?

Adistance traveled

Buniform velocity

Cuniform acceleration

Duniform speed

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