Measuring Mass

Q.

Question 1
What are the differences between the mass of an object and its weight?

Q.

What is the principle of spring balance?

Q.

A boy whose mass is 75 kg holds in his hands a bag weighing 40 N. With what force does the floor push up on his feet ? (Take g=9.8 m/s²⁾

Q. Why we feel weightless in a lift which is going to the lower floor?

Q.

There are two kinds of balances-beam balance and spring balance. If both the balances give the same measure of a given object on the surface of the earth, will they give the same measure on the surface of the moon? Explain why.

Q. What is a Spring balance?

Q.

A half-meter rod is pivoted at the center with two weights of 20 gf and 12 gf suspended at a perpendicular distance of 6 cm and 10 cm from the pivot respectively as shown alongside.

Which of the two forces acting on the rigid rod causes a clockwise moment?

Q. Which of the following instruments is used to measure the weight of an object.

1. Vernier Calliper
2. Screw gauge
3. Meter scale
4. Spring balance

Q.

A spring balance is graduated on a sea level . If a body is weighed at consecutively increasing heights from the earths surface, the weight indicated by the balance will

A)go on increase continously

B)go on decreasing continously

C) remain the same

D)first increase and then decrease

Q. A person jumps onto a cement floor from a height of 1 m and comes to rest in 0.1 second. The same person on jumping from a height of 9 m into a sandpit, comes to rest in 1 second. Compare the forces exerted on him by cement floor and sand pit.

Q.

What does single pulley mean and explain its working.

Q. Which physical quantity is measured using Spring Balance?

1. Mass
2. Volume
3. Weight
4. Density

Q. Name the scientist who invented the spring balance?

1. Robert Brown
2. Robert Hooke
3. Albert Einstein
4. Issac Newton

Q.

The spring balance measures

1. Mass of body attached to it

2. Weight of body attached

3. Weight of spring and body attached

4. Mass of spring and body attached

Q. Spring balance is used for measuring :

1. The force acting on an object
2. The force of friction
3. Magnitude of pressure
4. Relative motion between objects

Q.

The principle of spring balance is _________.

1. Hooke’s law

2. law of string

3. law of length

4. none of these

Q. Digital balance is a device to measure mass.

1. False
2. True

Q. Which of the following is used for measuring the mass of costly substances such as gold, silver or diamonds?

1. Physical Balance
2. Barometer
3. Electronic or Digital balance
4. Compression balance

Q. A spring balance gives the measure of the mass of a body. True or false.

1. True
2. False

Q. We can measure weights using both spring and beam balance. But on moon, which one will give accurate measuring ?

1. Spring Balance
2. Beam Balance
3. Both
4. None

Q. The working principle of spring balance is :

1. Newton's laws of motion
2. Hooke's law
3. Ohm's law
4. None of the above

Q. An object is weighed in the following places using a spring balance. In which place will it weigh the heaviest?

1. At the equator
2. On the Moon
3. At the pole
4. In outer space

Q. Write true or false for the following statements :
If a spring balance , holding a heavy object is released , it will read zero weight .

1. True
2. False

Q. weight can be found by using a physical balance

1. True
2. False

Q. A physicsal balance is more sensitive than a beam balance.

1. True
2. False

Q. In spring balances, the spring is used :

1. to apply forces
2. to store strain energy
3. to absorb shocks
4. to measure forces

Q. Name a common device, among the following, used to measure the weight of a body.

1. Spring balance
2. Beam balance
3. Rheostat
4. Potentiometer

Q. A man is standing on a spring platform. Reading of spring balance is 60 kg wt. If the man jumps outside the platform, then reading of the spring balance will :

1. Remains same
2. First increases and then decreases to zero
3. Decreases
4. Increases

Q. The weight of a balloon is $W_1$ when empty and $W_2$ when filled with air. Both are weighed in air by the same sensitive spring balance and under identical condition. Then

1. $W_1=W_2$, as the weight of air in the balloon is offset by the force of buoyancy on it
2. $W_2<W_1$, due to the force of buoyancy acting on the filled balloon
3. $W_2>W_1$ as the air inside is of a greater pressure and hence has greater density than the air outside
4. $W_2=W_1+$ weight of the air inside it

Q. Point out the odd one out of the following
beam balance, spring balance, physical balance

1. Spring balance
2. None
3. Beam Balance
4. Physical Balance