Online Test

Question # 1

In the formula for velocity of efflux v = √2gh, h is the

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Height of liquid column from bottom of vessel

Height of orifice from the bottom of the vessel

Height of liquid column above the orifice

Height of the vessel

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

Blue light has frequency 7.5 x 10¹⁴cs^-1. Its energy is

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3.1 eV

6.2 eV

5.6 eV

09.4 eV

A body termed as black body when it

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Reflects all radiations

Absorbs all radiations

Absorbs and radiates all radiations

None of these

Phase angle of a body executing SHM specifies the

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Displacement

Direction

Both a and b

None

The radiant energy:

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Always increases with increase in wave length

Always decreases with decrease in wave length

Initially increase and then decrease

Both (A) and B

None of these

In coordinate axes, the left ward forces are taken as

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Positive

Negative

Just units only

None of these

If a person with a spring balance and a body hanging from it goes up and up in an airplane then the reading of the weight of the body as indicated by the spring balance will

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Go on increasing

Go on decreasing

First increase and then decrease

Remains the same

In petrol engine, the fourth stroke is the

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Power

Compression

Exhaust

None of these

The units of torque and couple are

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N-m and N-m²respectively

N-m and N

N-m^-1for both

N-m²and N-m respectively

The ratio of shearing stress/shearing strain is called as

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modulus

Pascal modulus

Hooke's modulus

shear modulus

One light year is equal to

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9.5 x 10¹⁵m

9.5 x 10¹⁵sec

9.5 x 10¹⁵km

9.5 x 10¹⁵cm

The dead time of Geiger Muller counter is of the order of

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Micro second

Millisecond

More than millisecond

None of these

The SI unit of equivalent dose is

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Rad

Sievert (SV)

Gray (Gy)

None of these

The distance to the nearest galaxy is

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10²⁰ m

10²⁹ m

10³⁰ m

10³¹ m

A galvanometer gives full scale deflection when the current passing through it is 1mA. Its resistance is 100Ω. Without connecting additional resistance in series with it. it can be used as a voltmeter of range.

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V

0.010 V

V

0.100 V

Ionization energy of H atom is:

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-13.6eV

13.6evV

3.4eV

None

A chiminey works best when it is

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Tall

Exposed to air currents

Not tall but wide

a and b

How many kinds of laser are there

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Solid only

Liquid only

Gaseous only

All of these

A hole is drilled half-way to the centre of earth. A body weighs 200 N on surface of earth. How much will it weigh at bottom of the hole

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100 N

150 N

200 N

250 N

Which of the following quantities has not been expressed in proper units?

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Stress/Strain= Newton/metre²

Surface tension = Newton/metre

Energy = kg m/s

Pressure = newton/metre²

The waves which propagate by the collision of material particles are known as

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e.m waves

mechanical waves

light waves

microwaves

The ultrasound used to monitor the blood flow, has apparent frequency after detection depends on the

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Velocity of the blood flow

Quantity of blood

Percentage of red cells

All of these

The approximate efficiency of incandescent lamp is

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6 %

8 %

5 %

9 %

If back emf in a motor decreases, then it will draw

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zero current

small current

steady current

more current

In projectile motion the vertical acceleration is

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Zero

Maximum

'g'

None of these

Alpha particle:

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Is negatively chjarged

Is another name of Deuterium

Is a helium nucleas

Lighter than a protorn

Heavier than six neutrons

A system may be in equilibrium when

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the resultant force acting on it is zero

the resultant torque on it is zero

the sum of clockwise and anticlockwise moments (taken about the same point) are equal

all of them

The weber ampere per meter is equal to

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Joule

Henry

Newton

Watt

Find the change in internal energy when heat transferred to the system is 42 J

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15 J

10 J

5 J

2.5 J

Eel (Fish) when senses a danger, it turns itself into a living

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Creature

Light source

Battery

None of these

Work done by magnetic force on a charge particle while moving through magnetic field is

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qvB

vB/q

q/qB

Zero

In gases, the charge carriers are:

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Electrons

Positive ions

Negative ions

Both A and C

Both A and B

The Bernoulli's equation often expressed in

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The point which always remains at rest is

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antinodes

node

either of them

none of them

The force acting on a charge moving in a magnetic field

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is perpendicular to both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of them

When a meteorite enters into earth atmosphere its energy converts into

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Kinetic energy

Heat energy

Mechanical energy

None of these

The ionizing ability of β-particles is less then the α-particle about

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100 times less

150 times less

200 times less

None of these

Approximate power of flash light in watts: (2 cells)

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1.2

1.5

1.55

1.56

Which of the following has a greater concentration of impurity?

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base

emitter

collector

none of them

The close path taken for computation of magnetic flux density is referred to

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Ampere's law

Faraday's law

Gauss's law

Both A & C