Match the physical quantities with their correct SI units. List-I List-II (A) Planck's constant (I) kg m s - 2 (B) Torque (II) kg - 1 m 3 (C) Weight (III) m 2 kg s - 1 (D) Specific volume (IV) kg m 2 s - 2 The correct match is

A = III , B = IV , C = I , D = II

A = II , B = IV , C = I , D = III

A = IV , B = I , C = II , D = III

A = II , B = III , C = I , D = IV

HARD

Earn 100

Friction is due to:

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Important Questions on Physical World

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

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

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

Which of the following statement is incorrect?

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

The ratio

(\frac{E}{W})

of relative strength of electromagnetic force

(E)

to weak nuclear force

(W)

is,

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

A plano-convex lens of unknown material and unknown focal length is given. With the help of a spherometer we can measure the

HARD

Physics>Mechanics>Physical World>Fundamental Forces of Nature

A train is moving slowly at

2 m / s

next to a railway platform. A man,

1.5 m

tall, alights from the train such that his feet are fixed on the ground. Taking him to be a rigid body, the instantaneous angular velocity (in

rad / s

) is

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

Which of the following interactions is the weakest?

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

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

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

The nearest star to our solar system is

4.3

light years away. The distance of this star in Parsec is (Mean distance between the earth and the sun

= 1.5 \times 10^{11} m

and one light year

= 9.46 \times 10^{15} m)

MEDIUM

Physics>Mechanics>Physical World>Fundamental Forces of Nature

A shell of mass

20 g

is fired by a gun of mass

100 kg .

If the shell leaves the gun with a speed of

800 m / s,

the speed of recoil of the gun is

HARD

Physics>Mechanics>Physical World>Fundamental Forces of Nature

The maximum and minimum distances of a comet from the sun are

1.4 \times 10^{12} m

and

7 \times 10^{10}

m .

If it's velocity nearest to the sun is

6 \times 10^{14} m / s,

what is its velocity in the farthest position? (Assume the comet to be spherical)

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

Which of the following is not a unit of time?

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

Let

G, W, S

and

E

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

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

The dimension of light year

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

(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?

EASY

Physics>Mechanics>Physical World>Fundamental Forces of Nature

Match the physical quantities with their correct $SI$ units.

	List-I		List-II
(A)	Planck's constant	(I)	$kg m s^{- 2}$
(B)	Torque	(II)	${kg}^{- 1} m^{3}$
(C)	Weight	(III)	$m^{2} kg s^{- 1}$
(D)	Specific volume	(IV)	$kg m^{2} s^{- 2}$