Question # 1

Work done in raising a box depends on:

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How fast it is raised

The strength of the man

The height by which it is raised

None of the above

According to boyle's law, volume of a given mass of a gas is

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Inversely proportional mass at constant pressure

Directly proportional to pressure at constant temprerature

Inversely proportional pressure at constant temprature

None of these

Davisson and Germer, in their experiment used:

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Nickle crystal

Lead crystal

Graphite crystal

Glass

Three quarks make up a:

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Leptons

Mesons

Baryons

Quark

Gain of operational amplifier is independent of;

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Internal structure

External Structure

Batteries

Potential changes

Tick which of the following is not state variable:

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Heat energy

Pressure

Entropy

Volume

A church organ consist of open ended pipes ranging from 4m to 4 mm, if the speed ofsound is considered as 400 m/s then the min and max frequency is:

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400 Hz and 4 kHz

100 Hz and 100 kHz

50 Hz and 50kHz

400 Hz and 400 kHz

Which one of the following statements regarding electrostatics is wrong?

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Charge is conserved

Charge is quantized

There is no field near an isolated charge at rest

A moving charge produces both electric and magnetic fields

The fundamental frequency in a stretched string is 10 Hz. To double the frequency, the tension in it must be changed to:

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T₂ = 2T₁

T₂ = 4T₁

T₂ = T₁

none of these

If the range of a projectile is R, the potential energy will be maximum after the projectile has covered (from start) distance equal to:

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R/2

R/4

R

R/9

The motion of molecules in gases i:

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Orderly

Random

Circular

All of these

What is the resultant force in the diagram shown?

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Zero

6N to left

6N to right

11N to right

The temperature at which all the gases become liquid is called:

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273 K

-273 K

Absolute Zero

Both (B) and (C)

In a gravitational field when work done by gravity is negative then

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P.E increases

P.E decrease

None

P.E remains same

In photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

The rate of decay radioactive substance:

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Is constant

Decrease exponentially with time

Varies inversely with time

Decrease linearly with time

The number of electrons in a nucleus X of atomic number Z and mass number A is:

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A

W

Z

Y

A total charge of 100C flows through 12W bulb in a time of 50 second. Which is the potential difference across the bulb during this time?

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0.12V

6.0V

2.0V

24V

Initially, four identical uniform blocks, each of mass m and thickness h, are spread on a table How much work is done on the blocks in stacking them on top of one another?

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2 mgh

3 mgh

4mgh

6mgh

What is the momentum of a photon of light of wavelength 500 nm in kgm/s:

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1.32 × 10−21

1.32 × 10−23

1.32 × 10−25

1.32 × 10−27

The diode charactristics curve is plot between

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I & t

V& t

V& I

None

The diodes works on

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A.C

D.C

both A and B

None of these

Kinetic energy of a body moving with speed of 10 ms-1 is 30 J. If its speed becomes30 ms-1 then its K.E becomes

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10J

270 J

90J

180 J

A 4 m long string fixed at its ends resonate in 4 segments. The wavelength of the waveis:

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4m

0.5m

2m

0.25 m

Change in momentum per second is:

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Product force and time

Product of pressure and area

Ratio of pressure and area

None of these

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

Torque is necessary for producing.

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angular speed

linear acceleration

angular acceleration

none of these

The magnetic field produced due to the current in a straight wire is proportionalto the :

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Electric current

Conducting material

Length of the wire

Diameter of the wire

A body of mass 3 Kg lies on the surface on the table 2m high. It is moved on the surface by 4m. The change of P.E will be:

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Zero

9.8 J

19.6 J

329 J

Half-life of radon gas is:

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1620 years

3.8 days

7 days

11 days

A.H Compton studied the scattering of X-rays by loosely bound electrons from a graph target in:

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1905

1911

19251

1923

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

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Decreases

Increases

Remain same

None of the above

With the propagation of longitudinal waves through a material medium, the quantitiestransferred in the direction of propagation are:

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Energy, momentum and mass

Energy and momentum

Energy and mass

Energy

Which of the Following bulb will glow Brightest?

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100W

200W

300W

400W

The minimum energy required to remove an electron is called:

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Stopping potential

Work function

Kinetic energy

None of these

The product of resistance and conductance of a resistors is equal to:

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1

Conductivity

Resistivity

Zero

A proton, accelerated through a p.d V has a certain de Broglie wavelength. In order to have the same de Broglie wavelength, an 𝑎 −particles must be accelerated through a potential difference:

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4V

8V

V/4

V/8

The energy of photon of wavelength 1240 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

The time taken by an engine of power 10 kW to lift a mass of 200 kg to a heightof 40 m is (g + 10ms2)

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2 sec

4 sec

8 sec

16sec

The example of nuclear fusion is:

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Formation of barium and krypton from uranium

Formation of plutonium -235 from uranium -235

Formation of helium from hydrogen

Formation of water from hydrogen and oxygen

No entropy change is associated with:

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Isothermal

Adiabatic process

Isobaric process

None of them