CBSE > Class 07 > Science | CBSE Board | Homework Help

	Concave Mirror	Convex Mirror
Structure	A concave mirror is a spherical mirror in which the reflecting surface and the center of curvature fall on the same side of the mirror. In other words, if the mirror coating lies outside of the spherical surface, then it is known as a concave mirror.	A convex mirror is a spherical mirror in which the reflecting surface and the center of curvature lie on the opposite sides of the mirror. In other words, if the mirror coating lies in the inside of the spherical surface, then it is known as a convex mirror.
Other name	Converging Mirror	Diverging Mirror, Fish eye mirror
Image projection	Can be projected on a screen	Cannot be projected on a screen.
Meaning	Concave means “hollowed or rounded”.	Convex means “curved or rounded like the outside of a sphere or circle”.

1Thank You

ANSWER

Which gas is present in the bulb

Posted by Pratyush Pare 8 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Akhil Tomar 8 years, 1 month ago

Argon

0Thank You

Dheeraj Bansal 8 years, 1 month ago

Argon is present

1Thank You

? Ishika ?? 8 years, 1 month ago

Sorry argon

2Thank You

? Ishika ?? 8 years, 1 month ago

In 100vol. Argoni

1Thank You

ANSWER

A car travels at a distance of 54 km in 30 sec. What is the speed of the vehicle?

Posted by Senthamil Selvi 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Pratyush Pare 8 years, 1 month ago

Given that , Distance =54 km Time = 30 sec As we know that Speed = distance \ time =54/30 =1.8 =1800 m/sec

0Thank You

ANSWER

If distance is 54km and time is 30 minutes.find the speed of the vehicle

Posted by Senthamil Selvi 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

hetrops

Posted by Anbu K 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

What is distance-time graph?

Posted by Vedika Patil 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Raman Preet 8 years, 1 month ago

Distance time graph used to one physical quantity over another physical quantity it

1Thank You

ANSWER

I need more in the science

Posted by Arshiya Taj Arfa 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

What would happen if platelets are absent from the blood?

Posted by Harsh Raj 8 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Abinaya Sree 8 years, 1 month ago

Fight against the germs

2Thank You

Keerthana C 8 years, 1 month ago

Platelets help in clotting of blood so if you have got a cut it would be bleeding and not stop

1Thank You

Abinash Mishra 8 years, 1 month ago

If platelets are absent in our blood then if we have cut in our hand then bluding will not stop

3Thank You

ANSWER

What os air pressure

Posted by Gursewak Singh 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

What is air pressure

Posted by Gursewak Singh 8 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Keerthana C 8 years, 1 month ago

Air moves from high pressure to low pressure

0Thank You

Arvind Yadav 8 years, 1 month ago

Air pressure is defined as pressure exerted by the weight of wind called air pressure .

1Thank You

ANSWER

What us crystallization? Describe the crystallization of copper sulphate?

Posted by Anshuman Kumar 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Keerthana C 8 years, 1 month ago

Crystallization is a method of cooling solution to get crystals. Take a copper sulphate solution heat the solution and keep it aside for few minutes and you get copper sulphate solution

1Thank You

ANSWER

Which image does concave mirror forms

Posted by Vasu Batra 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

How are bases formed

Posted by Aiswarya Nair 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

What is understorey and crown?

Posted by Ishaan Madaan 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

What do you Mean by stomata?

Posted by Ketki Deshmukh 8 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Simran Choudhary 8 years, 1 month ago

Tiny pores will help plants in exchange gases

0Thank You

Sruti Banarjee 8 years, 1 month ago

The small pores with which exchange of gasses takes place is called stomata

3Thank You

Ketki Deshmukh 8 years, 1 month ago

It's a place where food is made by plant.

0Thank You

ANSWER

What is exact name of vitamin B1

Posted by Suryansh Singh 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Vedika Patil 8 years, 1 month ago

Thiamine

0Thank You

ANSWER

Difference between breathing and respiration

Posted by Khushdeep Kaur Lehal 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Keerthana C 8 years, 1 month ago

Breathing means inhaling and exhaling but respiration is a large system of breathing in that nose, trachea, pharynx, bronchi, bronchus, lungs, diaphragm

1Thank You

ANSWER

Define vegetative progation

Posted by Sehaj Bir 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Kritika Trehan 8 years, 1 month ago

A form of asexual reproduction in plants, in whichmulticellular structures become detached fromthe parent plant and develop into new individualsthat are genetically identical to the parent plant.For example, liverworts and mosses form smallclumps of tissue (called gemmae) that aredispersed by splashing raindrops to form newplants. Bulbs, corms, offsets, rhizomes, runners,suckers, and tubers are all important means ofvegetative reproduction and propagation incultivated plants.

1Thank You

ANSWER

Differences between ocean water and river water

Posted by Riya Parel 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Kritika Trehan 8 years, 1 month ago

Salinity

Perhaps the biggest difference is in the name itself. Saltwater contains salt, or sodium chloride. Freshwater may contain small amounts of salt, but not enough to be considered saltwater. Ocean water has an average salinity of 3.5 percent.

Density

Saltwater is denser than freshwater due to the sodium chloride dissolved in it. This means that a specific volume of salt water is heaver than the same volume of freshwater. Warmer salt water is less dense than colder saltwater, which results in the colder water sinking to the ocean floor. While colder water is denser, when water freezes into ice, it becomes less dense and floats on the surface.

Freezing Point

Both the freezing and boiling points of ocean water differ from freshwater, but only the freezing point is of concern in nature. The average freezing point for ocean water is -2 degrees Celsius, although it can be even lower than that if the salt content is higher or the water is under pressure. The typical freezing point for freshwater is 0 degrees Celsius.

2Thank You

ANSWER

What is Graph?

Posted by Kalindi Yadav 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Arvind Yadav 8 years, 1 month ago

Graph is the thing which shows ourselves exactly in the form of line and also in unit.

2Thank You

ANSWER

How humus is added to soil

Posted by Dheerendra Kumar 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

Images formed by concave lens

Posted by Aman Gaikwad 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

Can weather be predicted accurately? Give reasons

Posted by Sukirti Srivastava 8 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

What is the formula of blood

Posted by Ranjith Athrey 8 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Krishna Agrawal 8 years, 1 month ago

Each red blood cell is about 1/3 hemoglobin [by volume].plasma is about 92%.Water [with plasma proteins as the most abundant solutes].The main plasma protein groups are albumins , globulins and fibrinogens

1Thank You

ANSWER

Who is made TV

Posted by Tanu Parashar 8 years, 1 month ago

CBSE > Class 07 > Science