Mathematics 30/1/3 2018-2019 English Medium Class 10 Question Paper Solution

Two positive integers a and b can be written as a = x³y² and b = xy³. x, y are prime numbers. Find LCM (a, b). 

How many two digits numbers are divisible by 3?

In Fig. 1, DE || BC, AD = 1 cm and BD = 2 cm. What is the ratio of the ar (Δ ABC) to the ar (Δ ADE)?

Find the coordinates of a point A, where AB is the diameter of circle whose centre is (2, -3) and B is (1, 4).

For what value of k, the roots of the equation x² + 4x + k = 0 are real?

Find the value of k for which the roots of the equation 3x² - 10x + k = 0 are reciprocal of each other.

Find A if tan 2A = cot (A-24°).

Find the value of (sin² 33 + sin² 57°)

Find, how many two digit natural numbers are divisible by 7.

If the sum of first n terms of an AP is n², then find its 10th term. 

A game consist of tossing a one-rupee coin 3 times and noting the outcome each time. Ramesh will win the game if all the tosses show the same result, (i.e. either all thee heads or all three tails) and loses the game otherwise. Find the probability that Ramesh will lose the game.

Find the ratio in which the segment joining the points (1, –3) and (4, 5) is divided by the x-axis? Also, find the coordinates of this point on the x-axis.

A die is thrown once. Find the probability of getting a number which (i) is a prime number (ii) lies between 2 and 6.

Find c if the system of equations cx + 3y + (3 – c) = 0; 12x + cy – c = 0 has infinitely many solutions?

Find the HCF of 1260 and 7344 using Euclid's algorithm.

Show that every positive odd integer is of the form (4q + 1) or (4q + 3), where q is some integer.

Find all zeros of the polynomial 3x³ + 10x² − 9x − 4 if one of its zero is 1. 

PQ is a chord of length 8 cm of a circle of radius 5 cm. The tangents at P and Q intersect at a point T. Find the lengths of TP and TQ.

Prove that `(2+sqrt3)/5` is an irrational number, given that `sqrt 3` is an irrational number.

Prove that (sin θ + cosec θ)² + (cos θ + sec θ)² = 7 + tan² θ + cot² θ. 

Prove that (1 + cot A - cosec A ) (1 + tan A + sec A) = 2

A father's age is three times the sum of the ages of his two children. After 5 years his age will be two times the sum of their ages. Find the present age of the father.

A fraction becomes `(1)/(3)` when 2 is subtracted from the numerator and it becomes `(1)/(2)` when 1 is subtracted from the denominator. Find the fraction.

Find the point on the y-axis which is equidistant from the points (5, −2) and (−3, 2).

The line segment joining the points A(2, 1) and B(5, −8) is trisected at the points P and Q such that P is nearer to A. If P also lies on the line given by 2x − y + k = 0, find the value of k.

Find the mode of the following frequency distribution.

Water in a canal, 6 m wide and 1.5 m deep, is flowing with a speed of 10 km/hour. How much area will it irrigate in 30 minutes; if 8 cm standing water is needed?

In Fig. 3, ∠ACB = 90° and CD ⊥ AB, prove that CD² = BD x AD.

If P and Q are the points on side CA and CB respectively of ΔABC, right angled at C, prove that (AQ² + BP² ) = (AB² + PQ²)

Find the area of the shaded region in the given figure, if ABCD is a rectangle with sides 8 cm and 6 cm and O is the centre of the circle.

If sec θ = x + `1/(4"x"), x ≠ 0,` find (sec θ + tan θ)

Prove that “That ratio of areas of two similar triangles is equal to the square of the ratio of their corresponding sides.”

The following distribution gives the daily income of 50 workers of a factory.

Convert the distribution above to a 'less than type' cumulative frequency distribution and draw its ogive.

Construct a ΔABC in which CA = 6 cm, AB = 5 cm and ∠BAC = 45°. Then construct a triangle whose sides are `3/5` of the corresponding sides of ΔABC.

A bucket open at the top is in the form of a frustum of a cone with a capacity of 12308.8 cm³. The radii of the top and bottom circular ends are 20 cm and 12 cm, respectively. Find the height of the bucket and the area of metal sheet used in making the bucket. (use π = 3.14)

A man in a boat rowing away from a lighthouse 100 m high takes 2 minutes to change the angle of elevation of the top of the lighthouse from 60° to 30°. Find the speed of the boat in metres per minute [Use `sqrt3` = 1.732]

Two poles of equal heights are standing opposite each other an either side of the road, which is 80 m wide. From a point between them on the road, the angles of elevation of the top of the poles are 60° and 30º, respectively. Find the height of poles and the distance of the point from the poles.

Two water taps together can fill a tank in `1(7)/(8)`  hours. The tap with longer diameter takes 2 hours less than the tap with a smaller one to fill the tank separately. Find the time in which each tap can fill the tank separately.

A boat goes 30 km upstream and 44 km downstream in 10 hours. In 13 hours, it can go 40 km upstream and 55 km downstream. Determine the speed of the stream and that of the boat in still water.

If the sum of the first four terms of an AP is 40 and that of the first 14 terms is 280. Find the sum of its first n terms.