Question # 1

The combined effect of resistance and reactance in a.c. circuit is called

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conductance

resistance

impedance

choke

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

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parallel to the field

Perpendicular to the field

At an angle of 45 to the field

None of the above

'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?

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0

1

0.5

-1

The magnitude of the force producing an acceleration of 10 m/sec²in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

A circuit has a resistance of 11Ωan inductive reactance of 25Ωand a capacitance reactance of 18Ω. It is connected to an a.c. source of 200 V and 50 Hz. The current through the circuit (in amperes) is

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11

15

18

20

If we increase the length of a simple pendulum four times, its time period will become

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2 times

3 times

4 times

6 times

The direction of vector in space is specified by:

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One angle

Two angles

Three angles

None of these

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

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Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

Centripetal acceleration is also called ______ acceleration:

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Tangential

Radial

Angular

None of them

At absolute temperature, the kinetic energy of the molecules

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Becomes zero

Becomes maximum

Becomes minimum

Remain constant

Two circular rings have their masses in the ratio 1 : 2 and diameter in ratio 2 : 1 the ratio of their moment of inertia is

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1:4

4:1

2:1

√2:1

Speed of light in vacuum is

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0 ms^-1

3 x 10⁸ms^-1

1.5 x 10⁸ms^-1

None of these

Young's modulus for tungsten is

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90

190

390

590

Systematic error refers to an effect that influences particular quantity for the measurements which are

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All

Some

None

a and b

Unit of universal gas constant is SI is:

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W K^-1 mol^-1

J/Nk^-1 mol^-1

Jk^-1 mol^-1

erg K^-1 mol^-1

A person holds a bucket of weight 60 N He walks 7 m along the horizontal then climbs up a vertical distance of 5m. The work done by the man is

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300 j

720 j

420 j

None

Trajectory of projectile is

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Ellipse

Hyperbola

Parabola

None of these

In young's slit experiment on interference the ratio of the intensities of a bright band and a dark band is 6 : 1 the ratio of the amplitudes o the interfering waves is

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16

5/3

4

1/4

Pure form of semiconductor is called

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Extrinsic semiconductor

Intrinsic semiconductor

N type

P type material

Two bodies with masses M_A and M_b are moving with equal kinetic energy.Their linear momenta are numerically in a ratio

|P_A| : |P_b| will be:

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M_b : M_A

M_A : M_b

√M_A : √M_b

M²_A : M²_B

The torque is equal to

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Rate of change of velocity

Rate of change of angular momentum

Rate of change of linear momentum

Change of linear momentum

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