Weight and Mass

Q.

What is mass of the Earth?

Q.

Which of the following statements is correct?

Statement 1: Mass of a body is defined as the quantity of matter contained in it.
Statement 2: Mass of a body remains constant and does not change from place to place.
Statement 3: Mass of a body cannot be zero.
Statement 4: S.I unit of mass is kg.

1. Only statement 1 and 2 are correct

2. Only statement 1 is correct

3. ​Only statement 3 and 4 are correct

4. All statements are correct

Q.

How does gravity decreases with increase in depth

Q.

If the mass of an object be 10 kg, what is its weight ? $(g=9.8m/s^2)$.

Q.

Calculate the weight of a body of mass 10kg in kgf and newton

Q.

As the altitude of a body increases, do the weight and mass both vary ?

Q.

Stone dropped in a well hits water surface after 2 sec. What is the depth of well and with what speed will the stone hit the water surface?

Q. If the speed of light (c), acceleration due to gravity (g) and pressure (p) are taken as the fundamental quantities, then the dimension of gravitational constant is

1. c²g^op^-2
2. c^og²p^-1
3. cg³p^-2
4. c^-1g^op^-1

Q.

How much would a $70kg$ man weigh on the moon? What would be his weight on the Earth and on the moon? (Acceleration due to gravity of moon = $1.63m/s^2$)

Q.

What is the use of spring balance?

Q.

What is the weight of a 1 kilogram mass on the earth ? $(g=9.8m/s^2)$.

Q.

Astronauts feel weightless in International Space Stations due to zero gravity.

1. True

2. False

Q.

An object has mass of 20 kg on earth. What will be its (
i) mass, and (ii) weight, on the moon ?
(g on moon = $1.6m/s^2$).

Q.

A person is sitting in a lift accelerating upwards. The measured weight of a person will be

1. Less then actual weight

2. Equal to actual weight

3. More than actual weight

4. None of the above

Q.

(a) Define mass of a body. What is the SI unit of mass ?
(b) Define weight of a body. What is the SI unit of weight ?
(c) What is the relation between mass and weight of a body ?

Q.

Spring balance is used for measuring

1. The force acting on an object

2. The force of friction

3. Magnitude of the pressure

4. Relative motion between the object

Q.

Write down the weight of a 50 kg mass on the earth. $(g=9.8m/s^2)$.

Q. Why when we go inside Earth to its core its gravitional pull of earth decreases ? Plz show with derivation.

Q.

Assertion: The apparent weight of a body in an elevator moving with some downward acceleration is less then the actual weight of body.

Reason: The part of the weight is spent in producing downward acceleration, when body is in elevator.

1. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

2. If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.

3. If Assertion is true but Reason is false.

4. If the Assertion and Reason both are false.

5. If Assertion is false but Reason is true.

Q.

On what factor/factors does the weight of a body depend ?

Q.

A body has a weight of 10 kg on the surface of earth. What will be its weight when taken to the centre of the earth ?

Q.

If a man weighs $60kg$ on the surface of the earth, the height above the surface of the earth where his weight is $30kg$ is

1. $0.41R$

2. $\frac{1}{2}R$

3. $R/{\left(2\right)}^{\frac{1}{2}}$

4. $R/2$

Q.

If the distance between two objects is doubled, then the gravitational force between them is reduced to $\frac{1}{8}$th of the original value of force.

1. True
2. False

Q.

Can you overcome Gravity?

Q.

Which of the following quantities is a vector quantity?

1. Mass

2. Speed

3. Force

4. Distance

Q.

Given mass of the planet Mars is 6 × ${10}^{23}$ kg and radius is 4.3 × ${10}^6$ m. Calculate the weight of a man whose weight on earth is 600 N. (Given g on earth = 10 $\frac{m}{{sec}^2}$)

Q. Inside a lift, the apparent weight of a man is more than his actual weight. Then the lift is

1. Moving upward with constant velocity
2. Accelerating upward
3. Accelerating downward
4. Moving downward with constant velocity

Q.

Which is more fundamental, the mass of a body or its weight ? Why ?

Q.

Why is the weight of an object on the moon $\frac{1}{6}$ th its weight on the earth?

Q.

The mass of the moon is $7.34\times {10}^{22}kg$ and the radius is $1.74\times {10}^{6}m$. The value of gravitation acceleration on the moon will be

1. $1.45N/kg$

2. $1.55N/kg$

3. $1.75N/kg$

4. $1.62N/kg$