Explanation

• A transistor operates when it is properly biased and a suitable voltage is applied across its terminals.
• In a bipolar junction transistor (BJT), the emitter injects charge carriers into the base region.

Last verified on 02-11-2026

Explanation

• A lattice array is a regular, repeating arrangement of points representing the positions of atoms, ions, or molecules in a crystal.

Additional information:

• A unit cell is the smallest repeating structural unit that can generate the entire crystal lattice.
• A lattice constant is a parameter describing the dimensions of the unit cell, such as its edge lengths.

Last verified on 02-11-2026

Explanation

Displacement is shortest distance from start to end.

It forms a right angle triangle.

North = 20 Km

East = 10 Km

Formula: Displacement = sqrt( (20)^2 + (10)^2 )

Displacement = sqrt( 400 + 100 )

Displacement = sqrt( 500 )

Displacement = 22.36 Km

Last verified on 02-11-2026

Explanation

Syed Haider Shah is the current permanent representative of Pakistan to United Nations.

He was appointed on 31 October 2026.

He has replaced Asim Iftikhar Ahmad 

He has previously served as Pakistan’s ambassador to the Netherlands.

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Updated & verified on 02 Nov 2026

Explanation

Accuracy is decided by least count. Smaller least count means more accurate instrument.

2.0 gm -> least count 0.1 gm

20.0 gm -> least count 0.1 gm

0.0002 gm -> least count 0.0001 gm

Least count of 0.0002 gm is smallest (0.0001 gm), so its absolute error is smallest.

So it is measured by most precise instrument, so it is most accurate.

Last verified on 02-11-2026

Explanation

Formula: e = L x dI/dt

e = 200 V

dI = 5 - 0 = 5 A

dt = 0.1 sec

L = e x dt / dI

L = 200 x 0.1 / 5

L = 20 / 5

L = 4 H

Last verified on 02-11-2026

Explanation

Ig = 0.2 A (galvanometer current)

Rg = 10 ohm

I = 1.8 A (total current)

Current through shunt Is = I - Ig

Is = 1.8 - 0.2 = 1.6 A

Formula: Ig x Rg = Is x Rs

Rs = Ig x Rg / Is

Rs = 0.2 x 10 / 1.6

Rs = 2 / 1.6

Rs = 1.25 ohm

Last verified on 02-11-2026

Explanation

• Faisal Ayub is the current Minister for Sports of Punjab.
• Belonging: Lahore
• Party affiliation: Pakistan Muslim League (Nawaz)
• Appointed on 6th March 2024

Last verified on 02-11-2026

Explanation

• Electrostatics deals with electric charges at rest.
• Gauss's law relates the total electric flux through a closed surface to the net charge enclosed within it.
• The law itself is also valid for moving charges in the broader electromagnetic theory, but electrostatics specifically concerns stationary charges.

Last verified on 02-11-2026

Explanation

Unit of length = velocity x time

Unit of length = speed of light x 1 year

Unit of length = distance travelled by light in 1 year = 1 light year

c = 3 x 10^8 m/s

1 year = 365 days = 365 x 24 x 60 x 60 = 31536000 s = 3.15 x 10^7 s (approx 3.156 x 10^7 s)

Distance = c x t

Distance = 3 x 10^8 x 3.15 x 10^7

Distance = 9.45 x 10^15 m

Last verified on 02-11-2026