Find the odd one out:
(i) Voltmeter, ammeter, galvanometer, thermometer.
(ii) Loudspeaker, bar magnet, electric motor, microphone.
Reaction of iron nails with copper sulphate solution is an example of
(a) Combination reaction
(b) Decomposition reaction
(c) Displacement reaction
(d) Double displacement reaction
Dilute NaOH can be tested with
(a) red litmus paper
(b) blue litmus paper
(c) lime water
In series combination which remains constant?
(c) Both current and voltage
(d) Both are variables
An object of 10 cm is placed in front of a plane mirror. The height of image will be …………….
(a) 5 cm
(b) 15 cm
(c) 20 cm
(d) 10 cm
When a ray of light travels from air to glass slab and strikes the surface of separation at 90°, then it …………….
(a) bends towards normal
(b) bends away from normal
(c) passes unbent
(d) passes in zigzag way
Given below is a diagram showing a defect of human eye. Study it and answer the following questions.
(i) Name the defect shown in the figure.
(ii) Give reason for this defect of eye in human being.
(iii) Name the type of lens used to correct the eye defect.
Suggest measures to avoid noise pollution in classroom.
Suggest measures to minimize electricity consumption at home.
Suggest measures in bursting fire crackers in festivals and processions.
Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure).
Draw figure ‘Electric motor’ and working
Principle of Electric motor
Name any four appliances where electric motor is used.