// //]]>

Question & Answer Forum

Next time you have a doubt while studying, you know where to go. By simply posting your questions on Question & Answer Forum, you can have them answered by academic experts. You can also find related videos and explanations for better understanding.

Can’t find a match Ask?

Syeda answered 1 year(s) , 4 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...

Asked by Shruti

Nov 27

  • 7 Answers
  • 20 Likes
  • 123044 Views
Syeda answered 1 year(s) , 4 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

Answer.

(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

...

Asked by Chandan

Sep 24

  • 2 Answers
  • 10 Likes
  • 75611 Views
Sai Vijay answered 1 year(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.
...

Asked by Sagar

Aug 7

  • 30 Answers
  • 21 Likes
  • 70627 Views
Syeda answered 1 year(s) , 4 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

...

Asked by Maaz

Sep 1

  • 2 Answers
  • 3 Likes
  • 43932 Views
Syeda answered 1 year(s) , 4 month(s) ago

write any three uses of concave mirror.

Write any three uses of concave mirror
 
Answer:  Uses of concave mirrors: 

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

Asked by Sumaiya

Dec 3

  • 42 Answers
  • 27 Likes
  • 40560 Views
Syeda answered 1 year(s) , 4 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
...

Asked by Chandan

Nov 4

  • 3 Answers
  • 1 Like
  • 39437 Views
Syeda answered 1 year(s) , 4 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...

Asked by Reenasha

Sep 16

  • 4 Answers
  • 6 Likes
  • 38779 Views
Syeda answered 1 year(s) , 4 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

...

Asked by Omm

Jun 14

  • 3 Answers
  • 2 Likes
  • 36341 Views
Syeda answered 1 year(s) , 4 month(s) ago

What is the difference between Shadow and Image?

Answer.

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...

Asked by Chandan

Oct 29

  • 5 Answers
  • 2 Likes
  • 32269 Views
Syeda answered 1 year(s) , 4 month(s) ago

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

Answer.


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...

Asked by Sanjeev

Nov 7

  • 3 Answers
  • 0 Like
  • 28749 Views
Syeda answered 1 year(s) , 4 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...

Asked by Arunima

Feb 6

  • 6 Answers
  • 1 Like
  • 28031 Views
Syeda answered 1 year(s) , 4 month(s) ago

Describe the construction and working of a dry cell ?

Answer.


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...

Asked by Chandan

Nov 4

  • 3 Answers
  • 0 Like
  • 25821 Views
Syeda answered 1 year(s) , 4 month(s) ago

Difference between convergent and divergent beams of light

Answer.

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

...

Asked by Chandan

Sep 20

  • 2 Answers
  • 0 Like
  • 24707 Views
Syeda answered 1 year(s) , 4 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...

Asked by Gauri

Jan 5

  • 2 Answers
  • 2 Likes
  • 23794 Views
Abhisek commented 4 year(s) , 4 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

...

Asked by Mayand Dangi

Sep 23

  • 5 Answers
  • 1 Like
  • 18961 Views
Shriya answered 1 year(s) , 3 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.
...

  • 11 Answers
  • 6 Likes
  • 17206 Views
Syeda answered 1 year(s) , 3 month(s) ago

Why mercury is used as a thermometric fluid ?

Answer.

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...

Asked by Sneha

Jul 14

  • 2 Answers
  • 3 Likes
  • 14696 Views
Anshu answered 1 year(s) , 3 month(s) ago

how many types of thermometer we have

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

Asked by Anant

Apr 10

  • 5 Answers
  • 1 Like
  • 14295 Views
Syeda answered 1 year(s) , 3 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...

Asked by Deeksha

May 18

  • 4 Answers
  • 5 Likes
  • 13515 Views
Amarnathreddy answered 4 year(s) , 7 month(s) ago

sea breeze and land breeze

What is sea breeze?
During the day, the land gets heated faster than the water. The air over the land becomes hotter and rises up. The cooler air from the sea rushes in towards the land...

Asked by Kopal

Mar 11

  • 1 Answer
  • 2 Likes
  • 13258 Views
Like NextGurukul? Also explore our advanced self-learning solution LearnNext
Offered for classes 6-12, LearnNext is a popular self-learning solution for students who strive for excellence
Explore
Animated Video
lessons
All India
Test Series
Interactive Video
Experiments
Best-in class
books

Join India's most happening

Educational community