# 120 Most Important questions for CBSE Class 10 Mathematics and Science Board Exams 2018

Feb 1, 2018 16:18 IST
CBSE Class 10 Mathematics and Science: Important questions

CBSE Class 10 Board Exams 2018 will be commencing from 5th March, 2018. So, students are left with only one month to cement their learnings and get well prepared to write the perfect exams. During the month of February, students should avoid studying anything new. They must focus on practicing and revising what they have studied until now. Moreover, they must go through the important topics and practice the questions related to those topics. This will help to fine-tune your preparations for the board exams.

It’s very essential that students pick the reliable study material and question banks, which provide only important and meaningful stuff, so that students are able to make an effective preparation for the exam.

Here we are providing a set of important questions for CBSE class 10 Mathematics and Science. For both subjects different sets are designed with each set carrying 60 important questions.

CBSE class 10 Mathematics Important Questions:

This set will contain 60 questions divided into four parts:

 Question Type Number of Questions 1 Mark Questions 15 2 Marks Questions 15 3 Marks Questions 15 4 Marks Questions 15

Some sample questions from CBSE class 10 Mathematics Important Questions are:

Q. If the sum of first m terms of an AP is 2m2 + 3m, then what is its second term?

Q. Find the value of ‘k’ so that the zeros of the quadratic polynomial 3x2kx + 14 are in the ratio 7: 6.

Q. Determine whether the following system of linear equation has a unique solution, no solution or infinitely many solution.

4x − 5y = 3

8x − 10y = 6

Q. If the bisectors of adjacent angles P and Q of a parallelogram PQRS intersect at a point O, then find ∠POQ.

Q. Water flows through a circular pipe, whose internal diameter is 2 cm, at the rate of 0.7 m per second into a cylindrical tank, the radius of whose base is 40 cm. By how much will the level of water in the cylindrical tank use in half an hour?

Q. On a straight line passing through the foot of a tower, two points C and D are at distances of 4 m and 16 m from the foot respectively. If the angles of elevation from C and D of the top of the tower are complementary, then find the height of the tower.

Q. If the ratio of the sum of the first n terms of two A.Ps is (7n + 1):(4n + 27), then find the ratio of their 9th terms.

Get the complete set of questions from the following link:

CBSE Class 10 Science Important Questions:

This set will contain 60 questions divided into five parts:

 Question Type Number of Questions 1 Mark Questions 12 2 Marks Questions 12 3 Marks Questions 12 5 Marks Questions 12 Practical Based Questions (2 Marks each) 12

Some sample questions from CBSE class 10 Science Important Questions are:

Q. The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.

Q. What is the effect of DNA copying, which is not perfectly accurate, on the reproduction process?

Q. Give reasons for the following:

(a)  Arteries are thick walled.

(b) Blood goes only once in one cycle through the heart in fishes.

(c) Plants have low energy needs.

Q. The resistance of a wire of 0.01 cm radius is 10Ω. If the resistivity of the material of the wire is 50 × 10−8 ohm meter, find the length of the wire.

Q. (a) List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function.

(b) Write the function of retina in human eye.

(c) Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye? How and why should we organise groups to motivate the community members to donate their eyes after death?

Q. Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.
(a) Will the bulb in the two circuits glow with the same brightness? Justify your answer.

(b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.

Q. a) An organic compound A with molecular formula C2H4O2 on reaction with Sodium metal Na releases a gas B which readily catches fire. A on reacting with Ethanol in the presence of concentrated Sulphuric acid gives a sweet smelling substance C used in making perfumes.

Write a balanced chemical equation to represent these two reactions and identify   the compounds A, B and C.

(b) Differentiate between metals and non metals?

Q. An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre 'O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark the optical centre 'O', principal focus F and height of the image on the diagram.

Get the complete set of questions from the following link:

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