Electromagnetism is the branch of physics that studies the relationship between electricity and magnetism. It explores how electric currents generate magnetic fields and how changing magnetic fields produce electrical currents and wireless communication.
Physics chapter 6 class 10 Notes
One micro coulomb charge is equal to: 10-6c
A positive electric charge: Repels other positive charge
According to Fleming’s left hand rule the direction of magnetic field is indicated by: Forefinger
The magnetic field of a solenoid resembles as: Bar magnet
When a current carrying conductor is placed in magnetic field at right angle to it. The direction of force acting upon it is: At right angle to both the field and the current.
Totally reflecting prism is used in: Periscope and binocular
A converging lens becomes a magnifying glass when an object is placed: Inside the focal length
In electric motor, the brushes are made of: Graphite
In A.C. generator flux will be zero if coil is to the field: Parallel
When we heat the metal at high temperature they emit: Electrons
The line which passes through pole of the mirror and center of curvature is called principal: Axis
The shape of magnetic lines of force in case of a straight current carrying conductor is: Circular
Which type of energy is converted into mechanical energy in the D.C. Motor: Electrical energy
What is the direction of the magnetic field lines inside a bar magnet: From south pole to north pole
If the change of current in a circuit induces a current in another circuit, this phenomena is known as: Mutual induction
The standard group of bits in digital electronic is: 8 bits
Which device is used to increases / decreases A.C Voltage: Transformer
According to coulomb’s law, what happens to the attraction of two oppositely charged objects as their distance of separation increases: Decreases
The force on a current carrying conductor is maximum if angle between field and conductor is: 90o
If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire: Increases
The true ratio of a transformer is 10. It means: Ns = 10NP
When did Michael Faraday discover Electromagnetic induction: 1831
D.C. motor converts: Electrical energy into mechanical energy
The cathode ray oscilloscope consists of main parts: Three
Which part of a D.C. motor reverses the direction of current through the coil every half cycle: The slip rings
Number of poles in a magnet is: Two
The voltage is decreased by: Step-down transformer
Bouncing back of light after striking the surface is called: Reflection
Electric motor converts electrical energy into: Mechanical energy
The output of a two input NOR gate is 1 when: Both a and b are 0
If current is flowing from bottom end to the top end in a wire, according to right hand rule the direction of line of forces would be: Anti-clock wise
In D.C.motor split rings are made of: Copper
Changing magnetic field in a closed circuit can induce: Electric current
Optical fibres works on the principle of: Total internal reflection
A current carrying conductor produces a field around it is called: Magnetic field
The lines will be in the form of concentric circles, if conductor is: Straight
To see from submarine and the ship at the surface of water, we use: Periscope
In SI the unit of charge is: Coulomb
A.C generator works on the principle of: Electromagnetic induction
Who discovered Electromagnetic induction: Michael Faraday
According to Fleming’s left hand rule the direction of force on the conductor is given by: Thumb
Transformer Works on the principle of: Mutual induction
The refracted light striking to the side of prism is called: Incident ray
Transformer which increase voltage is called: Step-up transformer
In NOT gate number of input terminals is/are: 1
An object gains excess negative charge after being rubbed against another object, which is: Negatively charged
The end of solenoid from which lines of force emerge out is called: North pole
When an electric current passes through a conductor, which field is produced around it: Magnetic field
A transformer has Np =100 and Ns =500 , if 6 volt D.C is applied across its primary, the induced voltage: 0 V
Eight bits combine to form: A byte
In totally reflecting prism one angle is of 90°, and other two angles are of: 45°,45°
The refractive index of ice is: 1.31
Which animal have ability to move his eye lens: Fish
The number of lines of force in a magnetic field depends upon: Strength of field
When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called: Critical angle
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 acquires a negative charge
Which statement is true about the magnetic poles: A single magnetic pole does not exist
The minimum value of angle of deviation is called: Angle of minimum deviation
The speed of light in water is: 2.3×108 ms-1
The instrument which is used to display the magnitude of changing electric current is called: Cathode rays oscilloscope
The output of a NAND gate is 0 when: Both of its inputs are 1
The presence of a magnetic field can be detected by a: Magnetic compass
The direction of induced e.m.f. in a circuit is in accordance with conservation of: Energy
The angle at which prism deviates the incident ray is called: Angle of deviation
The ray of light after reflection from concave mirror passes through: Principal focus
In C.R.O grid is always connected with potential: Negative
The turn ratios of a transformer is 10. It means: Ns = 10 Np
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 coil of a transformer which is connected to A.C is called: Primary coil
Which device has two coils, primary and secondary: Transformer
In compound microscope, the objective have focal length than eye piece: Smaller
A transformer has 100 turns in its primary and 500 turns in secondary coil. If 6 volts D.C is applied across its primary, the voltage induced across its secondary coil will be: 0 volt
In totally reflecting prism one angle is of: 90°
Transformer works on _______ supply: A.C
The step up transformer: Increase the input voltage
Magnetic effect of electric current was first discovered by: Ampere
George Boole invented: Boolean algebra
The value of refractive index of water is: 1.33
Iron core is used in tranformer to: Enhance the flux
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