Current Electricity - MCQs

Current Electricity - MCQs Points : Current Electricity, mcqs, Current Electricity fill in the blanks, mechanics objective type questions 1. The specific resistance of all metals is most affected by
(a) applied magnetic field
(b) illumination
(c) pressure
(d) temperature

2. Through a metallic conductor an electric current is passed due to the drift of
(a) protons
(b) neutrons
(c) +ve ions
(d) free electrons

3. Through an electrolyte an electric current is passed due to the drift of
(a) protons
(b) free electrons
(c) + ye and -ye ions
(d) free electrons and holes

Optics - MCQs

Optics - MCQs Points : optics mcqs, optics fill in the blanks, optics objective type questions 1. A lamp is hanging at a height 40 cm from the centre of a table. If its height is increased by 10 cm the illuminance on the table will decrease by
(a) 10%
(b) 20%
(c) 27%
(d) 36%

2. Inverse square law for illuminance is valid for
(a) isotropic point source
(b) acylindrical source
(c) a search light
(d) all types of sources

3. In a movie hail, the distance between the projector and the screen is increased by 1%. The illumination on the screen is
(a) increased by 1%
(b) descreased by 1%
(c) increased by 2%
(d) decreased by 2%

Mechanics - MCQs

Mechanics - MCQs Points : mechanics - mcqs, mechanics fill in the blanks, mechanics objective type questions 1. Plank’s constant has the dimensions of
(a) energy
(b) work
(c) linear momentum
(d) angular momentum

2. The unit of power is
(a) kilowatt
(b) kilowatt-hour
(c) dyne
(d) joule

3. In the S.I. system, the unit of temperature is
(a) degrees centigrade
(b) kelvin
(c) degrees celsius
(d) degrees fahrenheit

Conversion of Electrical Energy to Mechanical Energy

Conversion of Electrical Energy to Mechanical Energy Points : Conversion of Electrical Energy to Mechanical Energy Electromechanical energy conversion means conversion of electrical energy into mechanical energy or mechanical energy into electrical energy.

TYPES OF MOTION

TYPES OF MOTION

Motion can be classified into following three types.

• Translatory motion

• Rotatory motion

• Oscillatory (Vibratory) motion.

1. TRANSLATORY MOTION

Definition: A motion of a body in which every particle of the body is being displaced by the same amount is called translational motion.

EXAMPLES:

• Motion of a car on a straight road.

• Motion of a train.

• Motion of falling bodies.

2. ROTATORY MOTION

Definition: When an object spins or rotates about a fixed point or axis, its motion is called rotational motion. OR Motion confined to a circle is called rotatory motion.

EXAMPLES:

• Rotation of Ferris wheel.

• Rotation of wings of electric fan

• Rotation of electron around nucleus

3. OSCILLATORY (VIBRATORY) MOTION:

Definition: To and fro motion of an object about a mean position executed at regular intervals of time is called vibratory motion.

EXAMPLES:

• Motion of pendulum.

• To and fro motion of a swing.

• Motion of wings of a bird.

Motion

Motion
Definition: When a body changing its position with respect to its surroundings is said to be in a state of Motion.

Example:

• The motion of a moving bus can be detected from its changing position with respect to its surrounding. 
• The motion of a moving train can be detected from its its changing position with respect to its surrounding.

Rest

REST

Definition: When a body is not changing its position with respect to its surrounding is said to be in a state of rest.

Example:

1. A Book lying on a table.

2. A Bus standing on the stop.

3. A bird sitting on a wall.

KINEMATICS

KINEMATICS

Definition: The branch of physics that deals with the description of motion of objects without reference to the force or agents causing motion is called Kinematics.

OR

Kinematics is the study of how things move. Here, we are interested in the motion of normal objects in our world. A normal object is visible, has edges, and has a location that can be expressed with (x, y, z) coordinates. We will not be discussing the motion of atomic particles.