List of practice Questions

Match the equivalent fractions and write two more for each. (i) $\frac{250}{400}$ (ii) $\frac{180}{400}$ (iii) $\frac{660}{990}$ (iv) $\frac{180}{360}$ (v) $\frac{220}{520}$ (a)$\frac{2}{3}$ (b)$\frac{2}{5}$ (c)$\frac{1}{2}$ (d)$\frac{5}{8}$ (e) $\frac{9}{10}$

Try to construct triangles using match sticks. Some are shown here. Can you make a triangle with:
(a) 3 matchsticks?
(b) 4 matchsticks?
(c) 5 matchsticks?
(d) 6 matchsticks? (Remember you have to use all the available matchsticks in each case) If you cannot make a triangle, think of reasons for it.

H₃PO₃can be represented by structures 1 and 2 shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing H₃PO₃? If not, give reasons for the same.

Ramesh had 20 pencils, Sheelu had 50 pencils and Jamaal had 80 pencils. After 4 months, Ramesh used up 10 pencils, Sheelu used up 25 pencils and Jamaal used up 40 pencils. What fraction did each use up? Check if each has used up an equal fraction of her/his pencils?

Reduce the following fractions to simplest form :

$\frac{48}{60}$
$\frac{150}{60}$
$\frac{84}{98}$
$\frac{12}{52}$
$\frac{7}{28}$

Check whether the given fractions are equivalent : (a) $\frac{5}{9}$, $\frac{30}{54}$ , (b) $\frac{3}{10}$, $\frac{12}{50}$ , (c) $\frac{7}{13}$, $\frac{5}{11}$

Find the equivalent fraction of $\frac{36}{48}$ with

numerator 9
denominator 4

Name each of the following triangles in two different ways: (You may judge the nature of angle by observation)

Find the equivalent fraction of $\frac{3}{5}$ having

denominator 20
numerator 9
denominator 30
numerator 27

Write the fractions and match fractions in column I with the equivalent fractions in column II.
$match fractions in column I with the equivalent fractions in column II$

Match the following:

Measure of Triangle		Types of Triangle
(i)	3 sides of equal length	(a)	Scalene
(ii)	2 sides of equal length	(b)	Isosceles right angle
(iii)	All sides are of different length	(c)	Obtuse angle
(iv)	3 acute angles	(d)	Right angle
(v)	1 right angle	(e)	Equilateral
(vi)	1 obtuse angle	(f)	Acute angle
(vii)	1 right angle with two sides of equal length	(g)	Isosceles

There are two “set-squares” in your box. What are the measures of the angles that are formed at their corners? Do they have any angle measure that is common?

Let PQ be the perpendicular to the line segment XY. Let PQ and XY intersect in the point A. What is the measure of $∠PAY$?

Which of the following are models for perpendicular lines:
(a) The adjacent edges of a table top.
(b) The lines of a railway track.
(c) The line segments forming the letter ‘L’.
(d) The letter V.

Which of the following is NOT the reason for calling steel more elastic than rubber ?

Name the three basic tissue systems in the flowering plants. Give the tissue names under each system.

Let $C$ be the centre of the circle $x^2+y^2-x+2 y=\frac{11}{4}$ and $P$ be a point on the circle A line passes through the point $C$, makes an angle of $\frac{\pi}{4}$ with the line CP and intersects the circle at the points $Q$ and $R$ Then the area of the triangle $PQR$ (in unit ${ }^2$) is :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Experimental reaction of $CH _3 Cl$ with aniline and anhydrous $AlCl _3$ does not give $o$ and p-methylaniline.
Reason (R) : The $- NH _2$ group of aniline becomes deactivating because of salt formation with anhydrous $AlCl _3$ and hence yields $m$-methyl aniline as the product.
In the light of the above statements, choose the most appropriate answer from the options given below :

An aromatic compound ‘A’ on treatment with aqueous ammonia and heating forms compound ‘B’ which on heating with Br₂ and KOH forms a compound ‘C’ of molecular formula C₆H₇N. Write the structures and IUPAC names of compounds A, B and C

Here is a crossword puzzle: Good luck!

a crossword puzzle
Across
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body
Down
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which causes cholera
7. A chemical to disinfect water

In the circuit shown in Fig.

(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?
(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

Will the compass needle show deflection when the switch in the circuit shown by Fig. is closed?

Will the compass needle show deflection when the switch in the circuit

Fig. shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.

From the top of 30 m tower AB the angle of depression to another tower’s QP base and top is 60º and 30º respectively. Another point C lies on tower AB such that CQ is parallel to BP (where B and P are the base of towers). Then the area of BCQP is?

The radius of Na atom forming bcc lattice (in Å)?