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2,483 questions

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Question 191

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 192

jamb 2021

Which of the following is not a vector quantity?

Amomentum

Bforce

Ctemperature

Ddisplacement

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Question 193

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 194

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 195

jamb 2021

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

AHydrometer

BManometer

CHygrometer

DHypsometer

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Question 196

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 197

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 198

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 199

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 200

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 201

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 202

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 203

jamb 2021

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

Adistance traveled

Buniform velocity

Cuniform acceleration

Duniform speed

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Question 204

jamb 2020

A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

A1600

B1200

C200

D2400

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Question 205

jamb 2020

Which of the following pairs is part of the electromagnetic spectrum?

I. Radio waves

II. sound waves

III. Gamma rays

IV. water waves

AI and II

BIII and IV

CI and III

DII and IV

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Question 206

jamb 2020

In which of the following diagrams is the length of the tube equal to one wavelength?

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Question 207

jamb 2020

Which of the following instruments consumes the highest current?

I. Electric iron

II. Television set

III. Torchlight

IV. Immersion heater

250v

220v

110v

1kW

110W

30W

500W

BII

CIII

DIV

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Question 208

jamb 2020

In the figure, the value of R is

A3\(\Omega\)

B6\(\Omega\)

C4\(\Omega\)

D5\(\Omega\)

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Question 209

jamb 2020

In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80\(^o\)C is known as the

Acooling temperature

Bboiling point

Cmelting point

Dvaporization point

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Question 210

jamb 2020

The fiqure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40\(^o\), then the value of W is

A28.0N

B48.0N

C288.0N

D50.0N

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