# Elements & Periodicity

## QUESTION:

Which of the following has strongest basic character?

## OPTIONS:

• P2O3
• Al2O3
• MgO
• Na2O3 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?

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

1.2 * 104

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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 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 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 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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