CBSE Class 10 - Maths - CH4 Quadratic Equations (Ex 4.1)

Quadratic Equations

NCERT Exercise 4.1

Standard form of equation is 

ax² + bx + c = 0

where a, b and c are the co-efficients and a ≠ 0

Q1: Check whether the following are quadratic equations :
(i)   (x + 1)² = 2(x – 3)
(ii)  x² – 2x = (–2) (3 – x)
(iii) (x – 2)(x + 1) = (x – 1)(x + 3)
(iv) (x – 3)(2x +1) = x(x + 5)
(v)  (2x – 1)(x – 3) = (x + 5)(x – 1)
(vi) x² + 3x + 1 = (x – 2)²

Answer:

CBSE Class 9 - Science - CH 3 - Atoms and Molecules

Atoms and Molecules

Molecular Structure

NCERT Solution, MCQs, Study Notes, Q & A

Q1: Who established the two important laws of chemical combinations?

Answer: Antoine L. Lavoisier and Joseph L. Proust

Q2: What are the laws of chemical combinations?

Answer: These are group of laws which describe how different elements and compounds combine together to form new compounds. Most of these were established based on chemical experimental results. These laws are:

CBSE Class 7 - Science - CH 7 - Weather, Climate and Adaptations of Animals to Climate

Weather, Climate and Adaptations of Animals to Climate

Weather Applet on
your smartphone.
Can you identify weather icons?

NCERT Solution, Q & A, MCQ

Q1(NCERT): Name the elements that determine the weather of a place.

Answer: Following are the important elements that determine weather of a place:

• Temperature
• Air pressure
• Humidity
• Rainfall
• Wind Speed

CBSE Class 10 - FIT - HTML (SA 2) MCQs

Foundations of Information Technology

HTML (SA-2) MCQs

Q1: Which of the following is an attribute of <Table> tag?

(a) SRC
(b) LINK
(c) CELLPADDING
(d) BOLD

CBSE Class 9 - Maths - CH15 Probability

Probability

Important Terms, NCERT Exercise 15.1, MCQs, Problems

Important terms
1. Randomness: The word has different definitions in different areas. In mathematics, in a sequence of numbers what shall be the next outcome number cannot be determined, we say it is a random sequence.
e.g. consider the sequence,
1, 3, 5, 7, 9, ?
We can easily predict the next number i.e. 11. This sequence has a pattern and it is non-random.

Consider the following sequence,
62,3, 64,78,75,?
Since we cannot predict the next outcome, we may say it is a random sequence.

Science (Quiz) for CTET, Class 6, 7 and 8

Science (Quiz) 

For CTET (Env. Studies Paper-1), Class 6, 7, 8 and NTSE

Q1: Which of the following is an energy giving food?

(a) Bread

(b) Pulses

(c) Fish

(d) Green Vegetables

Antonyms (Quiz)

Antonyms

A word which is opposite in meaning to the given word is called its Antonym.

Pick up the word or phrase from the choices which is close to opposite (antonym) to word asked.

1: MINOR

(a) heavy
(b) tall
(c) major
(d) big