Tag: physics

Questions Related to physics

A body has weight 10000 kg. It's weight in quintal will be

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. $10$

  2. $100$

  3. $1000$

  4. $0.01$

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Correct Option: B
Explanation:

We know that, $1$ quintal $=100\ kg$

Thus, $10000\ kg=\dfrac{10000}{100} $ quintal $=100$ quintal

What is the base unit for measuring distance in the metric system?

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. Gram

  2. Liter

  3. Meter

  4. Seconds

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Correct Option: C
Explanation:

In the metric system, distance is measured in meter.

Which of the following is the  non-metric unit of length?

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. millimeters

  2. centimeters

  3. meters

  4. inches

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Correct Option: D
Explanation:

Millimeters, centimeters and meters are the metric units of length and inches is the non-metric unit of length.

Which of the following is non-metric unit of length?

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. feet

  2. yards

  3. miles

  4. all of the above

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Correct Option: D
Explanation:

Millimeters, centimeters and meters are the metric units of length whereas feet, yards and miles are the non-metric units of length.

Which scale is best for measuring the length of a ladybug?

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. Millimeters

  2. Centimeters

  3. Meters

  4. Kilometers

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Correct Option: B
Explanation:

The size of a ladybug is very small, of the order of centimeters. Thus centimeters is the best scale for measuring the length of a ladybug.

The least value measured with metre-scale is (if the metre scale is divided into 1000) ....................... .

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. 1 mm

  2. 1 m 

  3. 1 cm

  4. 1 nm

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Correct Option: A
Explanation:
Since, $1 \ metre$ is divided into $1000$ divisions.
Least count of metre scale  $L.C. = \dfrac{1 \ m}{1000} = 0.001 \ m = 1 \ mm$

In the above instrument while measuring an internal diameter. $ID$ is set of $321 mm$ with no zero error . if cap end is after ${17^{th}}$ division and ${17^{th}}$ division of main scale coincides with the reference line, the $ID$ is:-

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. $321.717 mm$

  2. $321.87 mm$

  3. $328.17 mm$

  4. $324.67 mm$

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Correct Option: B

The unit of the quantity $g/G$ in SI will be

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. $kg$ ${m}^{-2}$

  2. $mk$ ${g}^{-2}$

  3. ${m}^{2}$ ${kg}^{-1}$

  4. ${kg}^{2}$ ${m}^{-1}$

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Correct Option: A

Light year is the unit of following physical quantity

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. Time

  2. Distance

  3. Mass

  4. None

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Correct Option: B

The average kinetic energy $E$ of a gas molecule is given by the equation$E=\cfrac{3}{2}kT$
where $T$ is the absolute (kelvin temperature)
What are the SI base units if $k$?

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. ${kg}^{-1}{m}^{-1}{s}^{2}K$

  2. ${kg}^{-1}{m}^{-2}{s}^{2}K$

  3. $kg$ ${ms}^{-2}{K}^{-1}$

  4. $kg{m}^{2}{s}^{-2}{K}^{-1}$

Show answer
Correct Option: D
Explanation:

Here ,

$E = \dfrac{3}{2}kT$
$\implies k= \dfrac{2E}{3T}$
$\implies [k] = \dfrac{[E]}{[T]}$
$\implies [k] = \dfrac{kgm^{2}s^{-2}}{K}$
$\implies [k] = kgm^2s^{-2}K^{-1}$