Question # 1

A fluid at a certain point has 50 J of potential energy per unit volume, 75 J of kinetic energy per unit volume,and 35 J of pressure energy per unit volume. the total energy of the fluid is

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125 J

90 J

160 J

85 J

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

The square of 0.4 is:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

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0°C

10°C

17°C

20°C

During the steady flow, different streamlines

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cannot across each other

can across each other

either of them

neither of them

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

In reverse-biased p-n junction, the reverse current is due to flow of:

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Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

Example of progressive wave is

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transverse waves

longitudinal waves

both of them

none of them

A thermistor is a resistor which is:

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Light Sensitive

Heat Sensitive

Sound Sensitive

All of these

None of these

Newton's laws are adequate for speeds that are

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low compared with the speed of light

equal to the speed of light

greater than the speed of light

all of them

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

Longitudinal strain can be produced in

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Glass

Water

Honey

Hydrogen gas

The energy gap is insulators becomes very large and has the value

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Few electron volt (eV)

Some electron volt (eV)

Several electron volt (eV)

None of these

A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

A constant volume gas thermometer is more sensitive than liquid thermometer because

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Gas expand more than liquid

Gases are easily obtained

Gases are much lighter

Gases do not easily change their state

According to Bernoulli s theorem velocity and pressure

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Are directly proportional

Are inversely proportional

Have no relation

Are equal

The electric field due to an infinitely long thin wire at a distance R varies as

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1/R

1/R²

R

R²

The range of the diameter of core in multimode graded index fibre is

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50 to 100 μm

50 to 1000 μm

None of these

In Newton's rings the thickness of air film at the point of contact is

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maximum

minimum

equal to wavelength

zero

The speed of swimming of porpoise is

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5 ms^-1

6 ms^-1

8 ms^-1

9 ms^-1

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