Question # 1

A charge Q is divided into two parts q and Q - q and separated by a distance R. the force of repulsion between them will be maximum when:

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q = Q/4

q = Q/2

q = Q

None of these

Angular momentum is

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Vector (axial)

Vector (polar)

Scalar

None of these

A p-n junction has a thickness of the order of

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1 cm

1 mm

10^-6 cm

10^-12 cm

If the metal bob is a simple pendulum is replaced by a wooden bob, then its time period will

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Increase

Decreases

Remain the same

First 'A' then 'B'

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

A man pushes a wall but fails to displace it. He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

In a capacitive circuit

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Current leads voltage by phase of π/2

Voltage leads current by phase of π/2

Current and voltage are in same phase

Sometime current and sometime voltage leads

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in he form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies same amplitude and same phase

Different frequencies and same phase.

Two bodies of masses m₁ and m₂ have equal momentum their kinetic energies E₁ and E₂ are in the ratio

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√m₁ : √m₂

m₁: m₂

m₂: m₁

m₁² : m₂²

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

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