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Important Questions on Physical World

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Physics>Mechanics>Physical World>Relation between Physics, Technology and Society

The physics behind fusion test reactor is:

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Physics>Mechanics>Physical World>Relation between Physics, Technology and Society

Methane is greenhouse gas because-

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Physics>Mechanics>Physical World>Relation between Physics, Technology and Society

A car moves in positive

Y

-direction with velocity

v

proportional to distance travelled

y

v (y) \propto y^{β}

, where

β

is a positive constant. The car covers a distance

L

with average velocity

<v>

proportional to

L

<v> \propto L^{1 / 3}

. The constant

β

is given as

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Physics>Mechanics>Physical World>Relation between Physics, Technology and Society

The three central concepts in Newtonian mechanics are

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Physics>Mechanics>Physical World>Relation between Physics, Technology and Society

In a particle accelerator, a current of

500 μ A

is carried by a proton beam in which each proton has a speed of

3 \times 10^{7} m / s

. The cross-sectional area of the beam is

1.50 m m^{2} .

The charge density in this beam (in

C / m^{3})

is close to

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Which of the following forces have highest range?
(a) Gravitational force
(b) Weak Nuclear force
(c) Electromagnetic force
(d) Strong Nuclear force

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Which of the following represents fundamental forces of nature?

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The period of oscillation of a simple pendulum is

T = 2 π \sqrt{\frac{l}{g}} .

Measured value of

l

20.0 cm

, known to

1 mm

accuracy and time for

100

oscillations of the pendulum is found to be

90 s

using a wristwatch of

1 s

resolution. The accuracy in the determination of

g

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Which of the following is a possible final step in applying the scientific method?

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Match the columns I and II

	Column I		Column II
A	Stoke's law	I	Pressure and energy
B	Turbulence	II	Hydraulic lift
C	Bernoulli's Principle	III	Viscous drag
D	Pascal's law	IV	Reynold's number

The correct match is

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Which of the following statement is incorrect?

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Physics>Mechanics>Physical World>Relation between Physics, Technology and Society

A total solar eclipse is observed from the earth. At the same time an observer on the moon views the earth. She is most likely to see ( $E$ denotes the earth)

Question Image

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The ratio

(\frac{E}{W})

of relative strength of electromagnetic force

(E)

to weak nuclear force

(W)

is,

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Let

G, W, S

and

E

be relative strengths of gravitational, weak nuclear, strong nuclear and electromagnetic forces. Identify the correct option

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(A) Ratio of the relative strength of gravitational to weak force is nearly $10^{- 3}$
(B) Ratio of the relative strength of gravitational to weak force is less than $10^{- 3}$
(C) Ratio of the relative strength of strong nuclear to electromagnetic force is nearly $10^{2}$
(D) Ratio of the relative strength of strong nuclear to electromagnetic force is nearly $10^{- 2}$ .

Which of the following is true?

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The angular diameter of a planet measured from earth is

90 " .

If the diameter of the planet is

π \times 10^{6} m,

then its distance from the earth is

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For the four sets of three measured physical quantities as given below. Which of the following options is correct?

(i)

A_{1} = 24.36, B_{1} = 0.0724, C_{1} = 256.2

(i i)

A_{2} = 24.44, B_{2} = 16.082, C_{2} = 240.2

(i i i)

A_{3} = 25.2, B_{3} = 19.2812, C_{3} = 236.183

(i v)

A_{4} = 25, B_{4} = 236.191, C_{4} = 19.5

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Choose the correct statement from following.

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A particle of mass

200 MeV c^{- 2}

collides with a hydrogen atom at rest. Soon after the collision, the particle comes to rest, and the atom recoils and goes to its first excited state. The initial kinetic energy of the particle (in

eV

) is

\frac{N}{4} .

The value of

N

is: (Given the mass of the hydrogen atom to be

1 GeV c^{- 2}

).........

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A carrot looks orange in colour because of the

β

carotene molecule in it. This means that the

β

carotene molecule absorbs light of wavelengths,

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Important Questions on Physical World

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