When Neils Bohr shook hand with Werner Heisenberg, what kind of force they exerted?
- AGravitational.
- ✓Electromagnetic.
- CNuclear.
- DWeak.
Answer: B.
View full solution →Question types
The Forces question types
27 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
27
Questions
6
Question groups
5
Question types
01
M.C.Q (1 Marks)
5 Q→021 Marks Question
1 Q→032 Marks Questions
10 Q→043 Marks Question
7 Q→055 Marks Questions
3 Q→06Case study (4 Marks)
1 Q→Sample Questions
The Forces questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The sum of all electromagnetic forces between different particles of a system of charged particles is zero:
- AOnly if all the particles are positively charged.
- BOnly if all the particles are negatively charged.
- COnly if half the particles are positively charged and half are negatively charged.
- ✓Irrespective of the signs of the charges.
Answer: D.
View full solution →Which of the following systems may be adequately described by classical physics?
- AMotion of a cricket ball.
- BMotion of a dust particle.
- CA hydrogen atom.
- DA neutron changing to a proton.
Let E, G and N represent the magnitudes of electromagnetic gravitational and nuclear forces between two electrons at a given separation. Then:
- AN > E > G
- BE > N > G
- CG > N > E
- ✓E > G > N
Answer: D.
View full solution →A $60\ kg$ man pushes a $40\ kg$ man by a force of $60N$. The $40\ kg$ man has pushed the other man with a force of :
- A$40N$
- B$0N$
- ✓$60N$
- D$20N$
Answer: C.
View full solution →Suppose the magnitude of Nuclear force between two protons varies with the distance between them as shown in figure. Estimate the ratio "Nuclear force/Coulomb force" for:
- A$x = 8fm$
- B$x = 4fm$
- C$x = 2fm$
- D$x = 1fm (1fm = 10^{-15} m).$
A body builder exerts a force of 150N against a bullworker and compresses it by 20cm. Calculate the spring constant of the spring in the bullworker.
Find the ratio of the magnitude of the electric force to the gravitational force acting between two protons.
List all the forces acting on the block B in figure.
A body of mass m is placed on a table. The earth is pulling the body with a force mg. Taking this force to be the action what is the reaction?
Is it true that the reaction of a gravitational force is always gravitational, of an electromagnetic force is always electromagnetic and so on?
When you hold a pen and write on your notebook, what kind of force is exerted by you on the pen? By the pen on the notebook? By you on the notebook?
At what distance should two charges, each equal to 1C, be placed so that the force between them equals your weight?
A lawyer alleges in court that the police has forced his client to issue a statement of confession. What kind of force is this?
The average separation between the proton and the electron in a hydrogen atom in ground state is $5.3 \times 10^{-11} m.$
View full solution →- Calculate the Coulomb force between them at this separation.
- When the atom goes into its first excited state the average separation between the proton and the electron increases to four times its value in the ground state.What is the Coulomb force in this state?
Figure shows a cart. Complete the table shown.
Two charged particles placed at a separation of 20cm exert 20N of Coulomb force on each other. What will be the force if the separation is increased to 25cm?
Two spherical bodies, each of mass 50kg, are placed at a separation of 20cm. Equal charges are placed on the bodies and it is found that the force of Coulomb repulsion equals the gravitational attraction in magnitude. Find the magnitude of the charge placed on either body.
A satellite is projected vertically upwards from an earth station. At what height above the earth's surface will the force on the satellite due to the earth be reduced to half its value at the earth station? (Radius of the earth is 6400km.)
Calculate the force with which you attract the earth.
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