CBSE - Class 9 - Maths - Lines and Angles (Ex. 6.1)

NCERT Excercise 6.1

Q1: In Fig. 6.13, lines AB and CD intersect at O. If ∠AOC + ∠BOE = 70° and ∠BOD = 40°, find ∠BOE and reflex ∠COE.

CBSE - Class 10- Science Proficiency Test Paper (2012) - Set-A

Class 10 - Science Proficiency Test Paper 2012 (Set-A)

(See Answer key at the end.)

CBSE - Class 10 - Proficiency Test Paper- Maths (Set-A)

Class 10 - Maths Proficiency Test Paper (Set-A)

(See Answer key at the end.)

CBSE Class 9 - Science - CH9 - Force and Laws of Motion (worksheet)

Isaac Newton

Force and Laws of Motion

Worksheet

Fill in the blanks

1. The study of motion of a body under the action of a force is called ______.

2. (Impulse/Force/Pressure) ______ is a push or pull acting upon an object.

3. The natural tendency of objects to resist a change in their state of rest or of uniform motion is called ______.

CBSE Class 9 - Science - CH6 - Tissues (Worksheet)

Tissues

(Worksheet)

Cardiac Muscle
credits:  Ijsbrand Kramer , University of Bordeaux

 

Fill in the blanks

1. ___________  is the process by which unspecialised structures become modified and specialised for performing specific functions.

2. Differentiation results in ________ (division/ summation/integration) of labour.

3. The study of the structure of tissues and organs is known as ______ .

4. Based on ability to divide, plant tissues may be classified as ________ and _____ tissues.

CBSE Class 11: Chemistry - CH1 - Laws of Chemical Combinations #chemistry #eduvictors

Antoine Lavoisier
credits:wikipedia

Laws of Chemical Combinations

Q1: List the laws that are collectively called Laws of Chemical combinations.

Answer:

1. Law of Conservation of Mass
2. Law of Constant Composition
3. Law of Multiple proportions
4. Law of reciprocal proportions
5. Law of Combining Volumes (Gay Lussac's law of Gaseous Volumes)
6. Avogadro Law

CBSE Class 9 - Maths - Ch6 - Lines and Angles (Set-2)

Octahedron

Lines and Angles: Q & A

Q1: Prove that two lines which are both parallel  to the same line, are parallel to each other.

Answer: 

Given: Three lines l, m, n in a plane such that l || m and m || n.

CBSE Class 9 English Communicative SA1 Sample Paper

Class 9 - English Communicative - SA1 - Paper

CBSE Class 11 - Chemistry - CH1 - Mole Concept

Q1: Define mole

Answer: A mole (or mol) is defined as the amount of substance which contains equal number of  particles (atoms / molecules / ions) as there are atoms in exactly 12.000g of carbon-12.

One mole of carbon-12 atom has a mass of exactly 12.000 grams and contains 6.02 × 10²³ atoms.

A mol is just a number like a dozen. A dozen equals to 12 eggs , a gross of Pencil equals to 144 Pencil. Similarly, mol is equal to 6.022 × 10²³(Avagadro constant). Mol is also known as chemist dozen.

CBSE Class 8 - Science - Ch4 - Metals and Non-Metals #eduvictors

Metals and Non-Metals

Class 8 - NCERT Chapter Solutions

Q1. Which of the following can be beaten into thin sheets?
(a) Zinc
(b) Phosphorus
(c) Sulphur
(d) Oxygen

Answer: (a) Zinc, as it is a metal. The rest of these are non-metals.

Q2. Which of the following statements is correct?
(a) All metals are ductile.
(b) All non-metals are ductile.
(c) Generally, metals are ductile.
(d) Some non-metals are ductile.

Answer: (c) Generally, metals are ductile.
Mercury (metal) is liquid at room temperature and cannot be drawn into wires. Therefore, it is non-ductile.