Question

1.)Group 18 elements are also called_____
(a)alkali metals
(b) alkali earth metals
(c) halogens
(d) noble gases

2.) The distance between optical centre and principle focus is_________
(a)radius
(b)focal length
(c) linear length
(d) 2 focal length

3.) The power of the lens is_____
a) 1/p
(b)1/q
(c) 1/f
(d) 1/l

4.) In the method of_______a less reactive metal is coated on more reactive metal.
(a )alloying
(b)galvanizing
(c) tinning
(d)electroplating

5.) The amount of heat energy required to raise the temperature of a unit mass of an object by 1°C is called the _________
(a)latent heat of fusion
(b) latent heat of vaporization
(c)specific heat of that object
(d) transformation of that object​

Answer 1

1. Group 18 elements are... d- noble gases.

2.distance is focal length.

3.power of lens is 1/f

4.electroplating.

5.specific heat (capacity) of that object

Answer 2

Answer:

1.)Group 18 elements are also called (d) noble gases

2.) The distance between optical centre and principle focus is (b)focal length

3.) The power of the lens is (d) 1/f

4.) In the method ofa less reactive metal is coated on more reactive metal.((d)electroplating

5.) The amount of heat energy required to raise the temperature of a unit mass of an object by 1°C is called the (c)specific heat of that object