Tag Archives: NUST physics solved question

Elements & Periodicity

QUESTION:

Which of the following has strongest basic character?

OPTIONS:

  • P2O3
  • Al2O3
  • MgO
  • Na2O3

CORRECT ANSWER:

Na2O3

EXPLANATION:

Basic character of oxides decrease within a period from left to right. All the given elements are in the period 2 and Na is the left most element of period 2.

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HEAT & THERMODYNAMICS

QUESTION:

An ideal gas heat engine operates in a Carnot’s cycle between 227 C and 127 C. It absorbs 6 * 104 heat at high temperature. The amount of heat converted into work is?

OPTIONS:

  • 6 * 104
  • 3 * 104
  • 1.6 * 104
  • 1.2 * 104

CORRECT OPTION:

1.2 * 104

EXPLANATION: 

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OPTICS

QUESTION:

In a compound microscope the magnification by objective = 20, magnification by eye piece = -1 the total magnification is:

OPTIONS:

  • M = -220
  • M = -0.19
  • M = -0.05
  • M = 220

CORRECT ANSWER:

M = -220

EXPLANATION:

m = m1 x m2

m = magnification

m1 = Linear magnification of the objective lens

m2 = Linear magnification of the eyepiece

So, m = -20 x 11 = -220

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WAVES & OSCILLATIONS

QUESTION:

A particle executes simple harmonic motion between X = -A and X = +A. The time taken for it to go from 0 to A/2 is T1, and to go from A/2 to A is T2. Then?

OPTIONS:

  • T1 < T2
  • T1 > T2
  • T1 = T2
  • T1 = 2T2

CORRECT OPTION:

T1 < T2

EXPLANATION:

Velocity is maximum at 0 and decreases as the bob moves from 0 to A (assume movement from left to right). So the time taken in moving from 0 to A/2 would be less than the time taken in moving from A/2 to A.

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MOTION, FORCE, WORK & ENERGY

QUESTION:

If Vins of a body is decreasing then value of its Ains could be? (V and A are velocity and acceleration)

OPTIONS:

  • A constant negative value
  • Increasing negative value
  • Zero
  • Both A & B

CORRECT OPTION:

Both A & B

EXPLANATION:

If velocity is decreasing, instantaneous acceleration could be a constant negative value or an increasing negative value.

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Vector & Equilibrium

QUESTION:

X and Y is the figure below are?

OPTIONS:

  • X = b + c and Y = a + b
  • X = a + c and Y = a – b
  • X = b and Y = a
  • X = b – c and Y = a + b

CORRECT OPTION:

X = b + c and Y = a + b

EXPLANATION:

This is vector addition in 3D space. Use vector addition head to tail rule to get the values of X and Y as shown in the figure below:

A + X = a + b + c therefore X = b + c.

Y is a simple addition of two vectors a and b.

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