Class I Lever

Q.

Scissors and pliers belong to the same class of levers. Name the class of lever.

1. $ClassIlever$

2. $ClassIIlever$

3. $ClassIIIlever$

4. $ClassIIlever$ or $ClassIIIlever$

Q. A chain of mass 10 kg and length 10 M is resting on a rough horizontal surface mew=0.2. A constant force of 20 newton is applied at one end. the tension in the midpoint of the chain is

Q. Which of the following are correct examples of first, second and third class levers?

1. $III$ and $I$ only
2. $I$ and $II$ only
3. $II$ and $III$ only
4. $I,II$ and $III$

Q.

The handle of a nutcracker is 16 cm long and a nut is placed 2 cm from its hinge. If a force of 4kgf is applied at the end of the handle to crack it, what weight if simply, placed on the nut will crack it

Q.

The Fulcrum lies in between the Effort and the Load in:

1. 0%

2. 75%

3. 50%

4. 100%

Q. If the effort arm is greater than the load arm, then the lever is called as

1. speed multiplier
2. force multiplier
3. time multiplier

Q.

Match the columns.

Column 1	Column 2
Lever of the first order	Screwdriver
Lever of the second order	Flyovers
Lever of the third order	Knife
Inclined plane	A mango cutter
Wedge	Nuts and bolts
Pulley	Human arm
Wheel and axle	Claw hammer
Screw	Flagpole

Q.

Joseph's mom is preparing chapatis for him. She uses the tong to put the chapatis on fire. What kind of machine is she using?

1. First order lever

2. Wedge

3. Pulley

4. Third order lever

Q. A bottle opener is an example of ____________ .

1. $1^{st}orderlever$
2. $2^{nd}orderlever$
3. $3^{rd}orderlever$
4. None

Q. Liquid exerts pressure in all directions
this is used in car break mechanism
explain

Q.

In a screw jack, a lever of length 2 m is rotated once to lift the car of 1000 kg by 20 cm. What is the effort applied to the simple machine?

1. $\frac{50}{\pi }$ kg wt

2. $\frac{100}{\pi }$ N

3. $\frac{100}{\pi }$ kg wt

4. $\frac{50}{\pi }$ N

Q.

In a class-three lever, the distance between the effort and the load is 40 cm and load arm is 1 m long. Find the length of the effort arm and then calculate the mechanical advantage.

Q. A catapult belongs to which class of lever ?

1. Class I
2. Class II
3. Class III
4. Class I and III both

Q. SI unit of both ______ and ______ is joule.

1. Work, force
2. Work, energy
3. Force, pressure
4. Work, Pressure

Q.

A block and tackle system has the velocity ratio 3. A man can exert a pull of 200 kgf. What is the maximum load he can raise with this pulley system if its efficiency is 50%?

1. 300 kgf

2. 360 kgf

3. 600 kgf

4. 180 kgf

Q. A lighter child can move a heavier child on a seesaw if :

1. He eats more to gain energy
2. He moves closer towards the fulcrum
3. Moves away from the fulcrum
4. He uses less effort

Q. Types of lever in which effort is in between fulcrum (F) and its load (L).

1. Class I
2. Class III
3. Class II
4. All

Q. The effort moves through a larger distance than the load by applying a small force. Identify the examples of devices from the following using the type of lever described.

1. Driving board
2. Pliers
3. Ice tongs
4. Nut cracker

Q.

The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end move?

1. 8m

2. 1m

3. 2m

4. 4m

Q. A wheel barrow belongs to which class of lever ?

1. Class I
2. Class II
3. Class III
4. Cant say

Q. Scissors is an example of :

1. first order lever
2. third order lever
3. second order lever
4. complex machine

Q. Which of the following is a first order lever?

1. Steel yard
2. Nut cracker
3. Tongs
4. Wheel barrow

Q. Effort arm is always greater than the load arm in :

1. first order lever
2. complex machine
3. second order lever
4. third order lever

Q. State true or false.
A crow bar is used for tearing a part a piece of wood.

1. True
2. False

Q. A pair of scissors is an example of :

1. First order lever
2. Second order lever
3. Third order lever
4. Complex machine

Q. Which of the following are first-class levers?

1. I and II only
2. I and III only
3. II and III only
4. I, II and III

Q. lf the distance between fulcrum and effort is more in a first order type lever, then :

1. Load can be lifted with less effort
2. Load has to be lifted with greater effort
3. Load should be equal to effort
4. Load should alwaYs bc less than effort

Q. A second order lever :

1. none of the above
2. increases the effort required
3. reduces the effort required
4. effort is equal to load

Q. Identify what class of levers the following objects belong to. State if mechanical advantage of these objects is more than, equal to or less than one.
Nut cracker, pliers, fire tong, wheel barrow and scissors.

Q. Third class levers acts as _______ multipliers.

1. speed
2. None of he above
3. both
4. load