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The vapour density of a volatile chloride of a metal is 95 and the specific heat of the metal is 0.13 Cal/g. The exact atomic weight of metal is

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Important Questions on Physics

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A straight rod of length

L

extends from

x = a

x = L + a .

The gravitational force it exerts on a point mass 'm' at

x = 0,

if the mass per unit length of the rod is

A + B x^{2},

is given by:

MEDIUM

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Using the rules for significant figures, the correct answer for the expression

\frac{0.02858 \times 0.112}{0.5702}

will be:

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

At what height from the surface of earth the gravitation potential and the value of g are

- 5.4 \times 10^{7} J k g^{- 2}

and

6.0 m s^{- 2}

respectively? Take the radius of earth as

6400 km

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

If the change in the value of

g

at a height

h

above the surface of the earth is the same as at a depth

x

below it, then (both

x

and

h

being much smaller than the radius of the earth)

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Three successive measurements in an experiment gave the values 10.9, 11.4042 and 11.42. The correct way of reporting the average value is-

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Two stones of masses $m$ and $2 m$ are whirled in horizontal circles, the heavier one in radius $\frac{r}{2}$ and the lighter one in radius $r$ . The tangential speed of lighter stone is $n$ times that of the tangential speed of the heavier stone. They are reported to experience the same centripetal force. The value of $n$ is,

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

What is the

SI

unit of density?

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Two satellites

S_{1}

and

S_{2}

are revolving around a planet in the opposite sense in coplanar circular concentric orbits. At time

t = 0,

the satellites are farthest apart. The periods of revolution of

S_{1}

and

S_{2}

are

3 h

and

24 h

respectively. The radius of the orbit of

S_{1}

3 \times 10^{4} km .

Then the orbital speed of

S_{2}

as observed from

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Among the following, the correct statement is :

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

The number of significant figures in

50000.020 \times 10^{- 3}

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A very long (length $L$ ) cylindrical galaxy is made of uniformly distributed mass and has radius $R (R < < L)$ . A star outside the galaxy is orbiting the galaxy in a plane perpendicular to the galaxy and passing through its centre. If the time period of the star is $T$ and its distance from the galaxy's axis is $r$ , then

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

The units nanometer and picometer are related as,

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A particle is moving in a circle of radius

r

under the action of a force

F = α r^{2}

which is directed towards centre of the circle. Total mechanical energy (kinetic energy + potential energy) of the particle is (take potential energy

= 0

for

r = 0

HARD

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

An automobile moves on a road with a speed of

54 k m h^{- 1}

. The radius of its wheels is

0.45 m

and the moment of inertia of the wheel about its axis of rotation is

3 k g m^{2}

. If the vehicle is brought to rest in

15 s

, the magnitude of average torque transmitted by its brakes to the wheel is:

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Four particles, each of mass

M

and equidistant from each other, move along a circle of radius

R

under the action of their mutual gravitational attraction. The speed of each particle is

EASY

Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

Suppose that the angular velocity of rotation of the Earth is increased. Then, as a consequence,

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

A star mass $M$ (equal to the solar mass) with a planet (much smaller than the star) revolves around the star in a circular orbit. The velocity of the star with respect to the centre of mass of star-planet system is shown below:

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The radius of the planet's orbit is closest to ( $1 AU = Distance Earth and Sun$ )

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

The number of significant figures in

0.00340

is _________

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

The temperature of an object is $60 ° C .$ Its value in Fahrenheit scale is

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Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Mechanics

0.27 g

of a long chain fatty acid was dissolved in

100 {c m}^{3}

of hexane.

10 m L

of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is

10 c m

. What is the height of the monolayer?
[Density of fatty acid

= 0.9 g c m^{- 3}; π = 3]

The vapour density of a volatile chloride of a metal is 95 and the specific heat of the metal is 0.13 Cal/g. The exact atomic weight of metal is

Important Questions on Physics

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