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$1 AU$ is equal to

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Important Questions on Physical World and Measurement

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

Convert $- 40 ° F$ into Celsius.

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

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

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

One angstrom

(\overset{\circ}{A})

is equal to:

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

A person in front of a mountain is beating a drum at the rate of

40

per minute and hears no distinct echo. If the person moves

90 m

closer to the mountain, he has to beat the drum at

60

per minute to not hear any distinct echo. The speed of sound is

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

The dimension of light year

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

Given below are two statements :
Statement I : Astronomical unit (Au), Parsec (Pc) and Light year (ly) are units for measuring astronomical distances.
Statement II : Au < Parsec (Pc) < ly
In the light of the above statements, choose the most appropriate answer from the options given below:

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

Experimentally it was found that a metal oxide has formula

M_{0.98} O .

Metal

M

is present as

M^{2 +}

adn

M^{3 +}

in its oxide. Fraction of the metal which exists as

M^{3 +}

would be :

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

What is the

SI

unit of density?

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

The units nanometer and picometer are related as,

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

A hot air balloon with a payload rises in the air. Assume that the balloon is spherical in shape with diameter of

11.7 m

and the mass of the ballon and the payload (without the hot air inside) is

210 kg

Temperature and pressure of outside air are

27 ° C

and 1 atm

= 10^{5} N / m^{2}

, respectively. Molar mass of dry air is

30 g

. The temperature of the hot air inside is close to [The gas constant,

R = 831 {JK}^{- 1} {mol}^{- 1}

]

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

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)

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

What is the density of water vapour at boiling point of water?

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

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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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

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]

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

The concorde is the fastest airlines used for commercial service.It can cruise at 1450 mile per hour. What is it in m/s ?

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

Size of observable universe is about

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why?

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

A laser is a source of very intense, monochromatic and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of moon from the earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the moon takes

2.56 s

to return after reflection at the moon's surface. How much is the radius of lunar orbit around the earth ?

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

Why do scientists use standard units to measure things?

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Physics>Mechanics>Physical World and Measurement>Measurement of Length, Mass and Time

1 Wb m^{- 2}

is equal to

1 AU is equal to

Important Questions on Physical World and Measurement

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$1 AU$ is equal to