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Syeda answered 1 year(s) , 1 month(s) ago

What is the difference between convex and concave mirrors and lens ?

MIRRORS
(1) The reflecting surface of the concave mirror is bulged inwards. But the reflecting surface of the convex mirror is bulged outwards.
(2) Concave mirror produces real and inverted imag...

Nov 27

• 20 Likes
• 112651 Views

Nov 27

Syeda answered 1 year(s) , 1 month(s) ago

Define the following:- (a) Center of curvature (b) Radius of curvature (c) Pole (d) principal axis (e) Principal focus (f) Focal length

(a) Centre of curvature is the centre of the sphere of which the spherical mirror is a part.

(b) Radius of curvature is the linear distance between the pole and the cen

...

Sep 24

• 10 Likes
• 67471 Views

Sep 24

Sai Vijay answered 10 month(s) , 20 day(s) ago

What is the difference between clinical and labratory thermometer?

Clinical thermo meter:  This thermometer is used in Clinics to measure the temperature of human body.
A clinical thermometer has a temperature range of only 35ºC to 42°C.
...

Aug 7

• 21 Likes
• 65350 Views

Aug 7

Syeda answered 1 year(s) , 1 month(s) ago

write any three uses of concave mirror.

Write any three uses of concave mirror

1. Concave mirror are used as reflectors in automobile headlight
...

Dec 3

• 27 Likes
• 39537 Views

Dec 3

Syeda answered 1 year(s) , 1 month(s) ago

Rest and motion are relative terms. Explain

Answer:  Rest and motion are the relative terms because they depend on the observer’s frame of reference.
If an observer is at rest in his or her own frame of reference, but he may be

...

Sep 1

• 3 Likes
• 39383 Views

Sep 1

Syeda answered 1 year(s) , 1 month(s) ago

Explain how does an electric bell work.

When an armature or iron is in contact with screw the current flows though the coil which becomes an electromagnet .As,a result it gets pulled towards the magnet .The hammer at the end of the strip of the gong...

Sep 16

• 6 Likes
• 35403 Views

Sep 16

Syeda answered 1 year(s) , 1 month(s) ago

Difference between primary and secondary cells

• A primary cell cannot be recharged whereas a secondary cell can be recharged.
• In a primary cell chemical reaction is irreversible whereas in a secondary cell chemical reaction is reversibl
...

Nov 4

• 0 Like
• 35064 Views

Nov 4

Syeda answered 1 year(s) , 1 month(s) ago

Difference between density and relative density?

The ratio between density of a substance and density of water is called relative density.

1. The ratio between density of a substance and density of water is call

...

Jun 14

• 2 Likes
• 33666 Views

Jun 14

Syeda answered 1 year(s) , 1 month(s) ago

What is the difference between Shadow and Image?

Shadows are black, whereas images are colourful. Shadows of objects placed in the sun change in length with the position of the sun through the day. Your shadow will be at its longest at...

Oct 29

• 2 Likes
• 29012 Views

Oct 29

Syeda answered 1 year(s) , 1 month(s) ago

Difference between convex mirror and convex lens and difference between concave lens and concave mirror

convex lens
A convex mirror is opaque whereas a convex lens is transparent.
A convex mirror causes reflection of light whereas a convex lens cau...

Nov 7

• 0 Like
• 27120 Views

Nov 7

Syeda answered 1 year(s) , 1 month(s) ago

What are the differences between concave and convex lens

Concave Lens:
1. It tends to bend inward.
2. These are thinner in the middle and thicker at the ends.

Convex Lens:
1. It tends to bend outward.
2. These are thick...

Feb 6

• 1 Like
• 27043 Views

Feb 6

Syeda answered 1 year(s) , 1 month(s) ago

Difference between convergent and divergent beams of light

Light rays from a point source of light travel in all directions, moving away with time. Such a beam of light is called a divergent beam of light.
A convergent beam of light rays comes togeth

...

Sep 20

• 0 Like
• 22727 Views

Sep 20

Syeda answered 1 year(s) , 1 month(s) ago

Describe the construction and working of a dry cell ?

A dry cell consists of a zinc container whose base acts as the negative electrode. The carbon rod placed at the centre with a brass cap acts as the positive electrode. This is su...

Nov 4

• 0 Like
• 21655 Views

Nov 4

Syeda answered 1 year(s) , 1 month(s) ago

Why do we use a soft iron core in an electromagnet?

Yes. It is correct.

The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing. Soft iron is used because it loses its magneti...

Jan 5

• 2 Likes
• 21061 Views

Jan 5

Abhisek commented 4 year(s) , 2 month(s) ago

A particle experience constant acceleration for 20 second after starting from rest. If it travels a distance X in first 10 sec. and Y in next 10 sec. Find relation between X & Y?

from s=ut+1 2a(t^2)

initial velocity u=0 m/sec          (particle starts from rest)

s1=1/2a(t^2)

s1=1/2a(10^2)

s1=50a ------------------(1)

now initial velocity

...

Sep 23

• 0 Like
• 16493 Views

Sep 23

Shriya answered 1 year(s) , 1 month(s) ago

What is the fastest and slowest mode of heat transfer ?

Answer:  R adiation is the fastest mode of transfer of heat, because radiation travels at the speed of light, which is very quick.
...

Aug 20

• 6 Likes
• 16004 Views

Aug 20

Syeda answered 1 year(s) , 1 month(s) ago

Why mercury is used as a thermometric fluid ?

1. It expands uniformly when heated.
2. It has low specific heat capacity.
3. I has a high boiling point (357 °C) and a low freezing point (-39 °C).
4. It is a go...

Jul 14

• 3 Likes
• 13189 Views

Jul 14

Syeda answered 1 year(s) , 1 month(s) ago

In places of hot climate it is advised that outer wall of houses should be painted white? Exlain

In places of hot climate the outer walls of the house are painted white as we know that the white colour reflects the rays of the sun where as darker colours absorb the heat rays so if dark colours are painted...

May 18

• 5 Likes
• 12249 Views

May 18

Anshu answered 1 year(s) , 1 month(s) ago

how many types of thermometer we have

There are two types of thermometers
1) Clinical thermometer
2) Laboratory thermometer

Apr 10

• 1 Like
• 12243 Views

Apr 10

Syeda answered 1 year(s) , 1 month(s) ago

What is difference between ultrasonic and infrasonic sound

Infrasonics have amplitude of less than 20Hz and ultrasonics have amplitude of more than 20MHz

Mar 17

• 1 Like
• 10830 Views

Mar 17

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