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9801.

If cos θ + sin θ = 2 cos θ, show that cos θ − sin θ = 2 sin θ.

Answer» If cos θ + sin θ = 2 cos θ, show that cos θ − sin θ = 2 sin θ.
9802.

Find the remainder when f(x)=3x4+2x3−x23−x9+227 is divided by g(x)=x+23.

Answer»

Find the remainder when f(x)=3x4+2x3x23x9+227 is divided by g(x)=x+23.

9803.

If there are 5 people in the height range 170-175 cm in a class of 50 people, the percentage of people in the height range 170-175 cm is__________.

Answer»

If there are 5 people in the height range 170-175 cm in a class of 50 people, the percentage of people in the height range 170-175 cm is__________.



9804.

The median of the distribution 2,3,4,7,5,1,6 is:

Answer»

The median of the distribution 2,3,4,7,5,1,6 is:

9805.

In the given figure, if ∠DOB = 2x - 5° and ∠AOC = 85°, then x = ___.

Answer»

In the given figure, if DOB = 2x - 5° and AOC = 85°, then x = ___.




9806.

11.If S1 , S2 , S3 be the sum of 3 Arthemetic series, first term of each being 1 and the respective common differences are 1,2 and 3, then prove that S1 + S3 = 2S1S3

Answer» 11.If S1 , S2 , S3 be the sum of 3 Arthemetic series, first term of each being 1 and the respective common differences are 1,2 and 3, then prove that S1 + S3 = 2S1S3
9807.

The time taken, in seconds, to solve a problem by each of 25 pupils is as follows: 16, 20, 26, 27, 28, 30, 33, 37, 38, 40, 42, 43, 46, 46, 46, 48, 49, 50, 53 ,58, 59, 60, 64, 52, 20 (a) Constuct a frequency distibution fof these data, using a class interval of 10 seconds. (b) Draw a histogram to represent the frequency distribution .

Answer»

The time taken, in seconds, to solve a problem by each of 25 pupils is as follows:

16, 20, 26, 27, 28, 30, 33, 37, 38, 40, 42, 43, 46, 46, 46, 48, 49, 50, 53 ,58, 59, 60, 64, 52, 20

(a) Constuct a frequency distibution fof these data, using a class interval of 10 seconds.

(b) Draw a histogram to represent the frequency distribution .

9808.

If there are two triangles, △ABC and △PQR, such that, AB = QR, BC = PR and CA = PQ, then ___.

Answer»

If there are two triangles, ABC and PQR, such that, AB = QR, BC = PR and CA = PQ, then ___.


9809.

Question 2 (i)Simplify (3+√3)(2+√2) .

Answer»

Question 2 (i)

Simplify (3+3)(2+2) .





9810.

how to factorize x3-6x2+11x-6

Answer» how to factorize x3-6x2+11x-6
9811.

The slant height of a cone with radius 15 cm and height 20 cm is

Answer»

The slant height of a cone with radius 15 cm and height 20 cm is


9812.

The mean ¯x of a grouped data is given by:

Answer»

The mean ¯x of a grouped data is given by:



9813.

In the figure, ∠1=600 and ∠2=(23)th of a right angle. Prove that l ||m.

Answer»

In the figure, 1=600 and 2=(23)th of a right angle. Prove that l ||m.


9814.

Question 18A quadrilateral whose opposite sides and all the angles are equal is aa) Rectangleb) Parallelogramc) Squared) Rhombus

Answer» Question 18

A quadrilateral whose opposite sides and all the angles are equal is a

a) Rectangle

b) Parallelogram

c) Square

d) Rhombus
9815.

Refer to the figure given. What is the length of the shadow that is formed by the stick AB? ___

Answer»

Refer to the figure given. What is the length of the shadow that is formed by the stick AB?


___
9816.

Find the centre of mass of a hemispharical disc of radius R. Given mass per unit area (σ ) is 2r.

Answer» Find the centre of mass of a hemispharical disc of radius R. Given mass per unit area (σ ) is 2r.
9817.

What is bar graph?

Answer» What is bar graph?
9818.

Question 10The diagonals of a quadrilateral ABCD intersect each other at the point O such that AOBO=CODO. Show that ABCD is a trapezium.

Answer» Question 10

The diagonals of a quadrilateral ABCD intersect each other at the point O such that AOBO=CODO. Show that ABCD is a trapezium.
9819.

Following frequency distribution gives the weights of the students of a class. Weight(in kg)31−3536−4041−4546−5051−5556−6061−6566−7071−75Number of students36139117421 Find the probability of (i) choosing a student at random whose weight is atmost 40kg (ii) choosing a student at random whose weight is greater than 40kg but less than 60kg (iii) choosing a student at random whose weight is greater than 60kg [3 MARKS]

Answer»

Following frequency distribution gives the weights of the students of a class.

Weight(in kg)313536404145465051555660616566707175Number of students36139117421

Find the probability of

(i) choosing a student at random whose weight is atmost 40kg

(ii) choosing a student at random whose weight is greater than 40kg but less than 60kg

(iii) choosing a student at random whose weight is greater than 60kg [3 MARKS]

9820.

In ∆PQR, ∠P = ∠R, QR = 4 cm and PR = 5 cm. Then PQ = ________.

Answer» In ∆PQR, ∠P = ∠R, QR = 4 cm and PR = 5 cm. Then PQ = ________.
9821.

If ABC and DEF are two triangles such that ΔABC ≅ ΔFDE and AB = 5cm, ∠B = 40°(a) DF = 5cm, ∠F = 60°(b) DE = 5cm, ∠E = 60°(c) DF = 5cm, ∠E = 60°(d) DE = 5cm, ∠D = 40°

Answer» If ABC and DEF are two triangles such that ΔABC ΔFDE and AB = 5cm, ∠B = 40°



(a) DF = 5cm, ∠F = 60°



(b) DE = 5cm, ∠E = 60°



(c) DF = 5cm, ∠E = 60°



(d) DE = 5cm, ∠D = 40°
9822.

The inner diameter of a circular well is 3.5 m. It is 10 m deep Find:(i) inner curved surface area.(ii) the cost of plastering this curved surface at the rate of Rs 40 per m2.

Answer» The inner diameter of a circular well is 3.5 m. It is 10 m deep Find:



(i) inner curved surface area.



(ii) the cost of plastering this curved surface at the rate of Rs 40 per m2.
9823.

A part of monthly expenses of a family on milk is fixed which is 1700rs and the remaining varies with the quantity of milk taken extra at the rate of 42rs per liter . taking the quantity of milk required extra as x litters and total expenditure on milk is y rs . write a linear equation in standard form.

Answer»

A part of monthly expenses of a family on milk is fixed which is 1700rs and the remaining varies with the quantity of milk taken extra at the rate of 42rs per liter . taking the quantity of milk required extra as x litters and total expenditure on milk is y rs . write a linear equation in standard form.

9824.

Condition satisfied by 2x +3y = -5 and 4x +6y -10 = 0 is:

Answer»

Condition satisfied by 2x +3y = -5 and 4x +6y -10 = 0 is:


9825.

If A(1, 3), B(−1, 2) and C(2, 5) and D(x, 4) are the vertices of a ||gm ABCD then the value of x is [CBSE 2012](a) 3 (b) 4 (c) 0 (d) 32

Answer» If A(1, 3), B(−1, 2) and C(2, 5) and D(x, 4) are the vertices of a ||gm ABCD then the value of x is [CBSE 2012]

(a) 3 (b) 4 (c) 0 (d) 32
9826.

Anita and Divya preparing for their exam. Anita says that: 3×515=785. But, Divya says: 3×515=765. Which of them is right? ___

Answer»

Anita and Divya preparing for their exam.
Anita says that:
3×515=785.
But, Divya says:
3×515=765.
Which of them is right? ___

9827.

Match the following decimal forms to their correct pq form.

Answer»

Match the following decimal forms to their correct pq form.

9828.

The inclination of the line root3x-y+3=0 with the positive X-axis is

Answer»

The inclination of the line root3x-y+3=0 with the positive X-axis is

9829.

Given △ DEF ∼ △ABC. If AB = 3 cm, BC = 2 cm, CA = 2.5 cm and EF = 4 cm, then the perimeter of △DEF is ____.

Answer»

Given DEF ABC. If AB = 3 cm, BC = 2 cm, CA = 2.5 cm and EF = 4 cm, then the perimeter of DEF is ____.


9830.

Absolute value of any integer is

Answer» Absolute value of any integer is
9831.

In order to find the slope of a given straight line , choose two points on the line, separated by a distance _________ the length of the line.

Answer»

In order to find the slope of a given straight line , choose two points on the line, separated by a distance _________ the length of the line.


9832.

A straight line is an angle with ___ measurement.

Answer»

A straight line is an angle with ___ measurement.

9833.

For a reaction: A+B→ C. △ H=30 kJ/mol and △ S= 60 J/K mol. The temperature, above which reaction will be spon†an eous is (1) 500^0C (2) 227^0C (3) 127^0C (4) 175^0C

Answer» For a reaction: A+B→ C. △ H=30 kJ/mol and △ S= 60 J/K mol. The temperature, above which reaction will be spon†an eous is (1) 500^0C (2) 227^0C (3) 127^0C (4) 175^0C
9834.

Find the complement of each of the following angles.(i) 55°(ii) 16°(iii) 90°(iv) 23 of a right angle

Answer» Find the complement of each of the following angles.

(i) 55°

(ii) 16°

(iii) 90°

(iv) 23 of a right angle
9835.

3. To fill a swimming pool two pipes are used,If the pipe of larger diameter used for 4 hours and the pipe of smaller diameter for 9 hours ,Only half of the can be filled.Find,How long it would take for each pipe to fill the pool separately ,If the pipe of smaller diameter takes 10 hours more than the pipe of larger diameter to fill the pool?

Answer» 3. To fill a swimming pool two pipes are used,If the pipe of larger diameter used for 4 hours and the pipe of smaller diameter for 9 hours ,Only half of the can be filled.Find,How long it would take for each pipe to fill the pool separately ,If the pipe of smaller diameter takes 10 hours more than the pipe of larger diameter to fill the pool?
9836.

In ΔPQR, the angle bisectors of ∠PQR and ∠PRQ meet at O. If ∠QPR=80∘, find the measure of ∠QOR

Answer»

In ΔPQR, the angle bisectors of PQR and PRQ meet at O.

If QPR=80, find the measure of QOR

9837.

The father of your father or mother is your

Answer»

The father of your father or mother is your


9838.

If A=⎡⎢⎣213145356⎤⎥⎦B=⎡⎢⎣145427583⎤⎥⎦ then which of the following is correct?

Answer»

If A=213145356B=145427583 then which of the following is correct?


9839.

It was a good idea for Avery Fisher Hall that most often conducts shows of New York Philharmonic orchestra, one of the Big Five orchestras in the world, to invite East West players, a theatre group based in Los Angeles, to stage an abridged version of Shakespeare's play, A Midsummer Night's Dream, with Mendelssohn's entire score attached. Conducted by Muah Ling and directed by Jennifer Chang, the result is a perfect combination of words and music in a setting-with the local woods skirting one side of the theatre-that is close to ideal.

Answer» It was a good idea for Avery Fisher Hall that most often conducts shows of New York Philharmonic orchestra, one of the Big Five orchestras in the world, to invite East West players, a theatre group based in Los Angeles, to stage an abridged version of Shakespeare's play, A Midsummer Night's Dream, with Mendelssohn's entire score attached. Conducted by Muah Ling and directed by Jennifer Chang, the result is a perfect combination of words and music in a setting-with the local woods skirting one side of the theatre-that is close to ideal.
9840.

One of the angles of a triangle 90° . If one of the remaining angles is twice the other , then the smaller of the remaining angles is (1) 30°(2) 45°(3) 50°(4) 60°

Answer» One of the angles of a triangle 90° . If one of the remaining angles is twice the other , then the smaller of the remaining angles is
(1) 30°
(2) 45°
(3) 50°
(4) 60°
9841.

Choose the correct option.If arc AXB and arc AYB are corresponding arcs and m(arc AXB) = 120° then m(arc AYB) = 12 eryyt4 (i) 140° (ii) 60° (iii) 240° (iv) 160°

Answer»
Choose the correct option.


If arc AXB and arc AYB are corresponding arcs and m(arc AXB) = 120° then m(arc AYB) = 12 eryyt4


(i) 140° (ii) 60° (iii) 240° (iv) 160°



9842.

x2+kx+6=(x+2)(x+3)

Answer» x2+kx+6=(x+2)(x+3)
9843.

The volume of a cuboid is x3 – x2 – 2x cubic units. If x=5 what are the dimensions?

Answer»

The volume of a cuboid is x3 – x2 – 2x cubic units. If x=5 what are the dimensions?


9844.

the equatiin of line 4x-4y-z+11=0=x+2y-z+1 can be put as

Answer» the equatiin of line 4x-4y-z+11=0=x+2y-z+1 can be put as
9845.

In the figure, ABCD is a parallelogram, AB and BC are equal to 15 cm and 6 cm respectively. If DF = 4 cm, what is the value of BE?

Answer»

In the figure, ABCD is a parallelogram, AB and BC are equal to 15 cm and 6 cm respectively. If DF = 4 cm, what is the value of BE?




9846.

Quantity is directly proportional to price, then find the constant of proportionality. Quantity 3 5 7 9 11 Price 150 250 350 450 550

Answer»

Quantity is directly proportional to price, then find the constant of proportionality.

Quantity 3 5 7 9 11
Price 150 250 350 450 550

9847.

If y=f(x) is the graph of an equationwhich intersects x-axis at 2 and -3.Write the equation of the graph

Answer» If y=f(x) is the graph of an equationwhich intersects x-axis at 2 and -3.Write the equation of the graph
9848.

If the sum of two numbers is 55 and the H.C.F. and L.C.M. of these numbers are 5 and 120 respectively, then the sum of the reciprocals of the numbers is equal to

Answer»

If the sum of two numbers is 55 and the H.C.F. and L.C.M. of these numbers are 5 and 120 respectively, then the sum of the reciprocals of the numbers is equal to

9849.

When light rays approach the slits as shown in the figure below making an angle θ with the central axis, the fringe width will be given by :

Answer»

When light rays approach the slits as shown in the figure below making an angle θ with the central axis, the fringe width will be given by :


9850.

In a triangle ABC, angle A- angle B=33degree and angle B- angle C=18 degree, then the measure of angle B is?

Answer»

In a triangle ABC, angle A- angle B=33degree and angle B- angle C=18 degree, then the measure of angle B is?