SPSC 25 years Past Papers 2001 to 2025

Q1811: The compounds having all the electrons paired are called ______?

تمام الیکٹرانوں کی جوڑی رکھنے والے مرکبات کو ______ کہا جاتا ہے؟

Paramagnetic

Ferromagnetic

Diamagnetic

None of these

Q1812: Aluminum bronze is an alloy which has composition of _____?

ایلومینیم کانسی ایک مصر ہے جس میں _____ کی تشکیل ہے؟

50% Al and 50% Cu

10% Al and 90% Cu

30% Al and 70% Cu

None of these

Q1813: Munro Guptill is a ______?

منرو گپٹل ایک ______ ہے؟

Cricket player of New Zealand

Cricket player of Sri Lanka

Football player of New Zealand

None of these

Q1814: What is 3% of 20?

0.4

0.7

0.6

None of these

Explanation

Calculate 3% of 20:

$3 % \times 20 = \frac{3}{100} \times 20 = 0.6$

Q1815: Leibniz's theorem is used to find the nth derivative of ______?

Product of two functions

Trigonometric functions only

Exponential functions only

None of these

Leibniz’s theorem gives a formula to find the nth derivative of the product of two functions.

Explanation

Leibniz’s theorem gives a formula to find the nth derivative of the product of two functions.
It uses the binomial expansion:

\frac{d^{n}}{d x^{n}} (u v) = \sum_{k = 0}^{n} (\binom{n}{k}) \cdot u^{(n - k)} \cdot v^{(k)}

Q1816: Drift velocity of an electron is ______?

الیکٹران کی بہاؤ کی رفتار ______ ہے؟

10^-3 m/sec

10^-8 m/sec

3 × 10^-8 m/sec

None of these

Q1817: One electron is moving in an electric and magnetic field. It will gain energy from ______?

ایک الیکٹران بجلی اور مقناطیسی میدان میں آگے بڑھ رہا ہے۔ یہ ______ سے توانائی حاصل کرے گا؟

Electric field

Magnetic field

Both of these

None of these

Q1818: Force acting on a charge moving in a magnetic field will not dependupon _____?

مقناطیسی میدان میں منتقل ہونے والے چارج پر کام کرنے والی طاقت کا انحصار _____ نہیں ہوگا؟

Intensity of the magnetic field

Its mass

Amount of charge

None of these

Q1819: The amount of work required to stop a moving object is equal to ______?

چلتی شے کو روکنے کے لئے درکار کام کی مقدار ______ کے برابر ہے؟

The mass of the object times its acceleration

The velocity of the object

The kinetic energy of the object

None of these

Explanation

Work required to stop an object is equal to the change in its kinetic energy (Work-Energy Theorem).

Since kinetic energy is given by $KE = frac{1}{2} m v^2$ , the work needed to bring the object to rest is equal to its initial kinetic energy.

Q1820: The figure of speech in which two words or phrases of opposite significance are set together for effect is called?

Pun

Litotes

Oxymoron

None of these