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2,483 questions

Question 1 of 20 2,483 total questions

Question 171

jamb 2022

A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?

Athe magnet is moved towards the stationary solenoid

Bthere is no relative motion

Cthe magnet is moved away from the stationary solenoid

Dthe solenoid is moved away from the stationary magnet

View Explanation & Discuss

Question 172

jamb 2022

An object 40 cm high is 30cm from the pin hole camera. If the height of the image formed is 20 cm. What is the distance of the image from the pin height?

A15 cm

B70 cm

C40 cm

D40 cm

View Explanation & Discuss

Question 173

jamb 2022

Consider the wave equation y = 5mm sin [1cm\(^{-1}\)x - 60s\(^{-1}\)t]. The wave number is?

A0.1 cm\(^{-1}\)

B10cm\(^{-1}\)

C1.0cm\(^{-1}\)

D2cm\(^{-1}\)

View Explanation & Discuss

Question 174

jamb 2022

A bar magnet is divided into two pieces, which of the following statement is correct?

Atwo new magnets are created

Bthe magnetic field of each separate piece becomes stronger

Cthe electric field is created

Dthe bar magnet is demagnetized

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Question 175

jamb 2022

Which of these is a derived unit?

AKilogram

BMetre

CNewton

DSecond

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Question 176

jamb 2022

The refractive index of a medium is the ratio of

Aspeed of light in vacuum to speed in medium

Bspeed in medium to speed in vacuum

Cfrequency to wavelength

Dwavelength to frequency

Question 177

jamb 2022

The SI unit of electric current is the

Aampere

Bvolt

Ccoulomb

Dohm

Question 178

jamb 2022

Which device converts mechanical energy to electrical energy?

Acapacitor

Btransformer

Cmotor

Dgenerator

Question 179

jamb 2022

Sound waves are

Alongitudinal

Bstationary

Ctransverse

Delectromagnetic

Question 180

jamb 2022

Which is a scalar quantity?

Avelocity

Bdisplacement

Cdistance

Dforce

Question 181

jamb 2022

Light travels fastest in:

Awater

Bglass

Cvacuum

Dair

Question 182

jamb 2022

Current is measured using which device?

Avoltmeter

Bammeter

Cohmmeter

Dgalvanometer

Question 183

jamb 2022

Gravity on Earth is approximately:

A9.8 m/s??

B3.2 m/s??

C1.6 m/s??

D10.8 m/s??

Question 184

jamb 2021

A 2H inductor has negligible resistance and is connected to a \(\frac{50}{\pi}\) Hz A.C supply. The reactance of the inductor is?

A200\(\Omega\)

B50\(\Omega\)

C\(\frac{100}{\pi}\)

D\(\frac{25}{\pi \Omega}\)

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Question 185

jamb 2021

An astronomical telescope is said to be in normal adjustment when the?

Aeye is accommodated

Bfocal length of an object lens is longer than that of eye piece

Cfinal image is at the near point of eye

Dfinal image is at infinity

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Question 186

jamb 2021

The velocities of light in air and glass are 3.0 x 10\(^8\)ms\(^{-1}\) and 2.0 x 10\(^8\)ms\(^{-1}\) respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?

A0.33

B0.50

C0.67

D0.75

View Explanation & Discuss

Question 187

jamb 2021

The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?

Aconcave mirror of focal length 5cm

Bconcave mirror of focal length 10cm

Cconvex mirror of focal length 5cm

Dconvex mirror of focal length 10cm

View Explanation & Discuss

Question 188

jamb 2021

A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is?

A3m

B5m

C6m

D10m

View Explanation & Discuss

Question 189

jamb 2021

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 180Hz?

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Question 190

jamb 2021

If a sound wave goes from a cold air region to a hot air region, its wavelength will?

Aincrease

Bdecrease

Cdecrease then increase

Dremain constant

View Explanation & Discuss

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