Physics 10th Class Chapter 4

Electrostatics is the branch of physics that deals with the study of stationary electric charges and their interactions. It covers concepts like electric fields, potential, and charge distribution, essential for understanding phenomena such as static electricity and capacitors.

Physics class 10 chapter 4 notes

Big unit of capacitance is: Farad

The speed of sound in air at 0°C is: 331ms-1

A positive electric charge: Repels other positive charge

One coulomb is equal to charge of ________ electrons: 6.25 x 1018

The speed of sound was accurately measured in: 1738

The SI unit of electric field intensity is: NC-1

The intensity level of whispering is: 30 dB

At room temperature, electrons cannot escape the metal surface due to _____.. of atomic nucleus: Attractive forces

In the presence of a charged body, an insulated conductor develops positive charge at one end and negative charge at the other end, this i called: Electrostatic induction

Volt is named after the Italian physicist: Alessandro volta

NOT gate is also called: Inverter

How many tubes or electron guns used in a colour television set: Three

Electric intensity is a quantity: Vector

If we double the distance between two charges, what will be the change in the force between them: One fourth

The sound level of rustling of leave is: 10 dB

If we double the distance between two charges, then force becomes: 1/4th

SI unit of capacitance is: Farad

If a charged body is brought near a negatively charged electroscope and the leaves of electroscope diverge, then the body is: Negatively charged

Field around a charge in which that charge exerts a force on a point charge brought in that field is called: Magnetic field

The frequency of silent whistle is: 20,000 Hz – 25000Hz

The speed of sound in iron at 25°C is: 5950 m/sec

Electric field lines of force were first introduced by: Farady

The speed of sound in are water at 25°C is: 1531ms-1

An object gains excess negative charge after being rubbed against another object, which is: Negatively charged

Five joules of work is needed to shift 10 C of charge from one place to another. The potential difference between the places is: 0.5 V

The intensity of lawn mover is: 10-2 wm-2

The electrostatic force acting on two charges each of 1 C separated by 1m is about: 9 x 109 N

Two uncharged objects A and B are rubbed against each other. When object B is placed near a negatively charged object C, the two objects repel each other. Which of these statements is true about object A: Becomes positively charged

The SI the unit of charge is: Coulomb

The brain of any computer system is: CPU

Which device is used to store charge: Capacitor

To hear echoes, the minimum distance of the obstacle from source of sound should be: 17m

Sound waves having frequency lower than 20 Hz are called: Infrasonic

The 1st practical electric battery is known as: Voltaic pile

In computer terminology information means: Processed data

One micro coulomb charge is equal to: 10-6C

1 Pico Farad is equal to: 10-12F

Bats can hear sound of frequency up to: 120, 000Hz

The unit of intensity of sound: Wm-2

Level of noise recommended in eight, hour work day: 85-90 dB

The technique or method used to absorb undesirable sounds by soft and porous surface is called: Acoustic protection

Mice can hear frequencies upto: 100, 000 Hz

The intensity level of train siren is: 120 dB

The S.I unit of electric potential is: Volt

Coulomb’s law is mathematically stated as: F = k q1 q2 / r2

Two charged spheres are separated by 2 mm. Which of the following would produced the greatest attractive force: +2 q and -2q

Electric potential is a quantity: Scalar

Mathematical formula of capacitance of a capacitor is: C = Q/V

The pitch of a sound is most closely related to its: Frequency

A positive electric charge: Repels other positive charge

Unlike charges always: Attract each other

SI unit of electric intensity is: NC-1

The speed of sound in air at 100°C is: 386ms-1

The unit of electrical energy is: Electron volt

The speed of sound in air at 21 °C is: 343ms-1

Electric field lines: never cross each other

Which is the most suitable means of reliable continuous communication between an orbiting satellite and earth: Mecrowaves

When frequency of sound wave is increased, which of the following decreases: i) Wavelength ii) Period iii) Amplitude: (i) And (ii) only

1 nano farad is equal to: 1 x 10-9F

Frequency of tuning fork depends upon its _____. of prongs: Mass

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate: the rod and the paper are oppositely charged

Sound waves having frequency higher than 20,000 Hz are called: Ultrasonic

A positive and negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is: 16 times larger than before.

1 bel= 10 dB

Which is used to investigate the properties of electron beam: Electron gun

In case of OR and AND operation, if switches s1 and s2 both are open then lamp is: Off

Old people cannot hear sound above than: 15000 Hz

According to Coulomb’s law , what happens to the attraction of two oppositely charged objects as their distance of separation increases: Decreased

Who developed the 1st practical electric battery: Alessandro volta

SI unit of electric potential is: Volt

Ultrasound waves carry energy: More

Capacitance is defined as: Q/V

1 volt is equal to: JC-1

Which frequency is used by elephants to communicate with each other: Low frequency

X=A.B. This equation is used for which operation: AND

The coulomb’s law is valid for the charges which are: stationary and pont charges

Intensity level of the sound produced by mosquito buzzing is: 40 dB

Safe level of noise depends on factors: Two

Important : Review all previous years’ 10 class past papers for comprehensive practice and better exam preparation.

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