Question 1. Answer the following questions:
(a) Explain the following terms:
(i) Electromagnet (ii) Rectilinear Propagation of light (iii) Energy (iv) Weight (v) Temperature
(b) State one point of difference between the following terms:
(i) Static friction and sliding friction.
(ii) Class I lever and Class III lever.
(iii) Luminous and Non-luminous bodies.
(iv) Umbra and Penumbra.
(v) Magnetic and Non-magnetic substances.
(c) Write one function of each of the following:
(i) Magnetic Compass. (ii) Wheel and Axle. (iii) Pin hole camera (iv) Thermometer (v) Screw.
(d) Convert the following quantities:
(i) 0.2 km = __________m.
(ii) 1 yard = __________m.
(iii) 150 kg = _________quintal.
(iv) 5mg = ___________kg.
(v) 5ft = _____________cm.
Dear Student,
1.(a)
i)Electromagnet:- An electromagnet is a coil of insulated wire wound around a piece of a magnetic substance such as soft iron. The magnetic substance acts like a magnet as long as the current flows in the wire.
Uses of an electromagnet:
(i) Electromagnets are used in a number of electric appliances such as electric bells and electric buzzers.
(ii) They are used in electric motors, which find wide application in fans, washing machines etc.
(iii) Very strong electromagnets are used in factories and cranes for lifting heavy iron pieces.
ii)Rectilinear Propagation of light:-Rectilinear Propagation of Light is the tendency of light to travel in straight lines. In a homogenous transparent medium, light travels in a straight line and this is known as rectilinear propagation of light.
Example:- Ray of light coming from the sun follow the rectilinear propagation of light.
iii)Energy:- In simple words, energy is the ability of a physical system to produce changes on other physical systems. Examples of energies are: light, sound, heat etc. The S.I. unit of energy is joules (J).
iv)Weight:- Weight is defined as the force acting on an object under the influence of the gravitational field. So it tells us the amount of gravitational acting on the object. The weight of an object is not a constant and depends upon the strength of the force and where its kept. Its SI units are Newtons (N)
v) Temperature:-Temperature is a degree of hotness or coldness the can be measured using a thermometer. It's also a measure of how fast the atoms and molecules of a substance are moving. Temperature is measured in degrees on the Fahrenheit, Celsius, and Kelvin scales.
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1.(a)
i)Electromagnet:- An electromagnet is a coil of insulated wire wound around a piece of a magnetic substance such as soft iron. The magnetic substance acts like a magnet as long as the current flows in the wire.
Uses of an electromagnet:
(i) Electromagnets are used in a number of electric appliances such as electric bells and electric buzzers.
(ii) They are used in electric motors, which find wide application in fans, washing machines etc.
(iii) Very strong electromagnets are used in factories and cranes for lifting heavy iron pieces.
ii)Rectilinear Propagation of light:-Rectilinear Propagation of Light is the tendency of light to travel in straight lines. In a homogenous transparent medium, light travels in a straight line and this is known as rectilinear propagation of light.
Example:- Ray of light coming from the sun follow the rectilinear propagation of light.
iii)Energy:- In simple words, energy is the ability of a physical system to produce changes on other physical systems. Examples of energies are: light, sound, heat etc. The S.I. unit of energy is joules (J).
iv)Weight:- Weight is defined as the force acting on an object under the influence of the gravitational field. So it tells us the amount of gravitational acting on the object. The weight of an object is not a constant and depends upon the strength of the force and where its kept. Its SI units are Newtons (N)
v) Temperature:-Temperature is a degree of hotness or coldness the can be measured using a thermometer. It's also a measure of how fast the atoms and molecules of a substance are moving. Temperature is measured in degrees on the Fahrenheit, Celsius, and Kelvin scales.
For remaining queries we request you to post them in separate threads to have rapid assistance from our experts
Regards