Question # 1

If F=0.04 N and X=4 cm then K=

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1 Nm^-1

2 Nm^-1

3 Nm^-1

4 Nm^-1

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3.6 x 10¹KJ

3.6 MJ

S.I. unit of planks constant is

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J-s^-1

J.s

J.s^-2

J.s²

What must be changing when a body is accelerating uniformly?

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the force acting on a body

the velocity of the body

the mass of the body

the speed of the body

The solids which has structure in-between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

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

The induced current in the loop can be Increased by

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both A and B

The Instantaneous value of alternative current maybe:

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The same as its RMS value

Greater than its Rms value

The same as its peak value

Any of these

None of these

Referring to above figure, current in coil P falls from its maximum value to zero

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

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voltmeters

resistance

electrode

current

A labourer carrying a distance a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:`

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Minimum work

Maximum work

Zero work

Negative work

Root out of the conventional source of energy:

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Energy from biomass

Hydroelectric energy

Geothermal energy

None of these

The vector in space has:

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One component

Two components

Three components

None of these

The relation V = IR represents

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Ampere law

Faraday's law

Ohm's law

Len's law

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

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81 K

355 K

627 K

627°C

The three equation of motions are useful only for

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linear motion with increasing acceleration

line motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

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Bright

Dark

Any of A and B

None of these

The motional e.m.f depends upon the

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Length of a conductor

Strength of a magnet

Speed of the conductor

All of the above

An L-R circuit has R = 10 Ω and L = 2 H. If 120 V, 60 Hz A.C. voltage is applied, then current in the circuit will be

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0.32 A

0.16 A

0.48 A

0.80 A

A real gas can be approximated to an ideal gas at

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Low density

High pressure

High density

Low temperature

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

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C

C/2

Zero

2C

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

A cold soft drink is kept on the balance. When the cap is opened, then the weight

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Increases

Decreases

First increases, then decreases

Remains same

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

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