Which of the following phenomena is caused by static electricity?
- aBoiling of water
- bRusting of iron
- cA comb attracting small pieces of paper
- dBurning of fuel
110 questions · 14 sections
Which of the following phenomena is caused by static electricity?
The center of an atom is called the —
Which sub-atomic particle has no charge?
The magnitude of the charge of a proton is —
Which particle is negatively charged?
Out of 118 known atoms, how many are stable?
A water molecule is formed by —
Cooking gas (methane) consists of —
The simplest atom is —
The nucleus of a helium atom contains —
The process of removing electrons from an atom is called —
If two electrons are removed from a neutral atom, the atom becomes —
Which group consists only of electrical conductors?
Which one of the following is a non-conductor of electricity?
In a neutral atom —
Excluding hydrogen, in a stable atom —
Consider the following statements:
When a glass rod is rubbed with silk, the glass rod becomes —
When a glass rod is rubbed with silk, electrons move from —
Why does glass become positively charged when rubbed with silk?
When plastic is rubbed with flannel —
Two like-charged bodies brought near each other —
Two unlike charges —
Unlike gravitational force, electric force —
Which of the following statements is true?
The process by which a neutral body acquires charge without contact is called —
When a positively charged rod is brought near a neutral metal sphere kept on an insulating stand —
Why do paper pieces fall away from a comb after sticking to it?
Static-electricity experiments work poorly during the rainy season because —
A child's hair stands up while crawling on a carpet because —
Lightning is caused by —
Consider the following statements about electrostatic induction:
Which device is used to detect the presence of static charge?
The leaves of an electroscope are usually made of —
The leaves of a charged electroscope diverge because —
To determine the nature of an unknown charge using an electroscope, one must first —
A positively charged electroscope is touched by an object and the gap between the leaves decreases. The charge on the object is —
The disc, rod and leaves of an electroscope are made of conducting material so that —
According to Coulomb's law, the force between two point charges is —
The value of the Coulomb constant is —
The unit of the constant in Coulomb's law is —
The SI unit of electric charge is —
One coulomb of charge passes a point when —
The charge of an electron is —
Two charges of C and C are placed 1 m apart. The force between them is —
The magnitude of the force between C and C charges placed 10 cm apart is —
If the distance between two point charges is doubled, the electrostatic force between them becomes —
Two charges and produce a force at distance . If both charges are doubled and the distance is halved, the new force becomes —
Two negative charges always —
The charge of a proton is —
Electric field intensity at a point is defined as —
The SI unit of electric field is —
The electric field at a distance of 10 m due to a 5 C charge is —
A 3 C charge experiences a force of 10 N. The electric field at the location is —
The concept of electric lines of force was first introduced by —
Lines of force around an isolated positive charge —
Lines of force around an isolated negative charge —
Where electric lines of force are denser, the electric field is —
Lines of force from one charge —
At the midpoint of the line joining two equal positive charges, the electric field is —
The relation implies that —
The tangent drawn to a line of force at a point gives —
The electric potential at a point is the work done in bringing —
The SI unit of electric potential is —
1 volt is equal to —
The electric potential at a distance from a point charge is given by —
Electric potential is a —
If 10 J of work is required to bring a charge of 2 C from infinity to a point, the potential at that point is —
Charge flows from one point to another due to —
A crow on a high-voltage wire is not shocked because —
In everyday potential measurements, the reference zero potential is taken as that of the —
Heavy electrical equipment is grounded (earthed) so that —
A potential difference of 2 V between two points means —
The capacitance of a conductor is the ratio of —
The SI unit of capacitance is —
The capacitance of an isolated metallic sphere of radius is —
The energy stored in a capacitor of capacitance at voltage is —
The energy stored in a 20 µF capacitor when 10 V is applied is —
The energy stored in a 10 µF capacitor at 12 V is —
The simplest practical capacitor consists of —
In a photocopy machine, ink particles stick to the roller because —
The Van de Graaff machine is used to —
Charge inside a Van de Graaff sphere is transferred to the outer surface because —
A metal chain is hung from a fuel truck to —
While working with sensitive ICs, the worker wears a grounding wrist-strap to —
A lightning arrestor on a tall building works because —
The speed of sound, used to estimate the distance to lightning, is approximately —
We see the lightning flash before hearing the thunder because —
During a thunderbolt, the temperature of the air can rise up to about —
In an electrostatic colour spray, the paint particles spread out evenly because —
The thunder we hear during a thunderbolt is —
The apparatus used in Investigation 10.01 is —
After combing the hair, the aluminium-foil ball jumps toward the comb because —
The aluminium-foil ball jumps away soon after touching the comb because —
The name of the apparatus used to determine the presence of charge is —
On which factor does the electrostatic force between two charges not depend?
The unit of electric field intensity is —
Two charged spheres A and B are shown in Figure 10.18. Consider the following:
A 10 µF capacitor is connected to a 12 V potential difference. How much energy is stored in the capacitor?
Charge is a fundamental property of matter that —
If the electric potential at a point is zero, then the electric field at that point —
When Rima combs her hair, the comb gets charged because —
To determine the nature of the charge on Rima's comb using an electroscope, one should —
Electric force is the force that acts between —
Electric field and electric field intensity differ because —
In a system of three collinear charges, the net electric force on a particular charge is zero when —
A neutral atom is electrically neutral because —
An uncharged object becomes charged by friction when —
A child's hair stands up while crawling on a carpet because —
A potential difference of 2 V between two points in an electric field means —