Mass versus Weight

Q.

On a see-saw two children of masses 30kg and 50kg are sitting on one side of it at distances 2 m and 2.5m respectively from its middle. Where should a man of mass 75 kg sit to balance it?

1. 2.47 m

2. 3.47 m

3. 2.90 m

4. 1.48 m

Q. The wall of a dam is made thicker at the bottom because ___.

1. it is economically feasible
2. it looks beautiful
3. the government has laid down specific regulations to make the base of dams broader
4. it supports increased water pressure at the depth

Q.

A force of $20\mathrm{N}$ acts on an area of $20{\mathrm{cm}}^2$. Calculate the pressure exerted.

Q.

The weight of a body on earth is 98 N, where the acceleration due to gravity is 9.8 m s^-2. What will be the mass and weight of the body on the moon? Acceleration due to gravity on the moon is 1.6 m s^-2.

Q.

A person can lift the maximum of $15kg$ on the Earth. If the moon's gravity is $\frac{1}{6}th$ of the Earth, what will be the maximum mass he can lift?

1. $60kg$

2. $15kg$

3. $80kg$

4. $90kg$

Q.

It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.

Q. The mass and weight of an object on earth are $5kg$ and $49N$ respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is $1/6^{th}$ of that on the earth.

1. $5kg$ and $8.17N$
2. $5kg$ and $4.27N$
3. $10kg$ and $24.61N$
4. $10kg$ and $16.12N$

Q. The weight of two bodies are 2.0 N and 2.0 kgf respectively. What is the mass of each body ?

1. 0.2kg and 2kg
2. 5kg and 0.5 kg
3. 2kg and 20 kg
4. 20kg and 0.2 kg

Q.

A boy weighs $600N$ on the Earth. What would be his weight on the moon?

1. 600 N

2. 100 N

3. 9.8 N

4. 0

Q.

The mass and weight of an object on earth are 5kg and 49N respectively. What will be their values on the moon ? Assume that the acceleration due to gravity on the moon is 1/6th of that on the earth .

Q. Luke Skywalker has a mass of $13kg$ and weight of $127.4N$ on Earth. Find his weight on the Endor moon. Acceleration on Endor due to gravity is $2m{s}^{-2}$.

1. $254.8N$
2. $13kg$
3. $26N$
4. $127.4kg$

Q.

A body weighs $60N$ on Earth. What will be its weight on the moon if the acceleration due to gravity on Moon's surface is $\frac{g}{6}$? $\text{Take}g=10m{s}^{-2}$

1. Same in all directions

2. Greater in the upward direction

3. Greater in the downward direction

4. None of these

Q. Relative density of silver is 10.5. The density of silver in SI unit is _________.

1. $10.5\times {10}^{3}kg{m}^{-3}$
2. $10.5\times {10}^{3}gc{m}^{-3}$
3. $20.5\times {10}^3$ $kg{m}^{-3}$
4. $20.5\times {10}^{3}gc{m}^{-3}$

Q.

Assuming earth to be a sphere of a uniform density, what is the value of gravitational acceleration in a mine $100km$below the earths surface $\_\_\_\_\_\_\_\_m{s}^{-2}.$

1. $9.66$

2. $7.64$

3. $5.00$

4. $3.1$

Q. If the Earth loses its gravity, then for a body

1. mass becomes zero
2. weight becomes zero
3. both mass and weight are zero
4. neither mass nor weight is zero

Q.

The SI unit of pressure and thrust are respectively:

1. Pa and N

2. N and $N{m}^{-1}$

3. $N{m}^{-1}$ and N

4. N and Pa

Q.

A boy is standing on a weighing machine in a lift and the reading of the scale is $600N$. The lift experienced a breakdown and started falling freely under the action of gravity, what would be the reading of the scale?

1. $600N$

2. $100N$

3. $0N$

4. can't be predicted

Q. Mass of 1 amu in gram

Q.

If a force of $10\mathrm{N}$ acts on two surfaces having area in the ratio $1:2$, then the ratio of thrusts will be

1. $1:2$

2. $2:1$

3. $3:1$

4. $1:1$

Q.

If ${\mathrm{m}}_{\mathrm{e}}$ is the mass of a body on the surface of the earth and ${\mathrm{m}}_{\mathrm{m}}$ is the mass of the same body on the moon then

1. ${\mathrm{m}}_{\mathrm{e}}=6{\mathrm{m}}_{\mathrm{m}}$

2. ${\mathrm{m}}_{\mathrm{e}}<{\mathrm{m}}_{\mathrm{m}}$

3. ${\mathrm{m}}_{\mathrm{e}}>{\mathrm{m}}_{\mathrm{m}}$

4. ${\mathrm{m}}_{\mathrm{e}}={\mathrm{m}}_{\mathrm{m}}$

Q.

The mass of a body on the earth is $m$.Its mass on moon is___.

Q.

If the mass of a body is 5 kg, its weight on the surface of the earth would beN. Take $g=9.8m{s}^{-2}$

Q.

The weight of an astronaut and his space suit on Earth is 60 kgf and 30 kgf respectively. Their combined weight on Moon will be___ kgf. (Acceleration due to gravity on Moon is $\frac{1}{6}$ of acceleration due to gravity on Earth)

Q. Ships stay afloat because the upthrust of water is _______ as compared to the weight of the ship.

1. more
2. equal
3. less
4. zero

Q.

If a person weighs $600kg$ on earth, what will be his weight on the moon?

Q.

A boy weighs 600N on earth. What would be his weight on the moon?( g = 10$\frac{m}{{sec}^2}$)

1. 100N

2. 600N

3. 200N

4. 400N

Q. The same amount of pressure is applied uniformly and perpendicular to the surfaces of two objects. Choose the correct option.

1. The object having more surface area experiences more force.
2. The object having less surface area experiences more force.
3. Force is zero in both cases.
4. Force is independent of pressure applied.

Q.

If a body is taken from place to place, what will change; mass or weight?

Q.

1 $Pa$ is equal to

1. $1N/m^2$

2. $10N/m^2$

3. $100N/m^2$

4. $100000N/m^2$

Q.

If the mass of a ball is 5 kg on Earth, then what would be its mass on Jupiter?

1. Zero

2. 5/6 kg

3. 5 kg

4. 10 kg