User Forum

What is the sum of the 4 numbers in SQUARE 10?



A 160
B 154
C 138
D 182

Different substances are classified as :
I. Pure substance
II. Homogeneous mixture
III. Heterogeneous mixture
A few common substances are listed below.
(i) Air, (ii) Graphite, (iii) Gasoline, (iv) Diamond, (v) Tap water, (vi) Iron, (vii) Sodium chloride, (viii) Iodised salt, (ix) Brass, (x) Oil and water

Which of the following represents the correct classification of the given substances?
A I - (ii), (vi), (ix); II - (i), (v), (vii); III - (iii), (iv), (viii), (x)
B I - (ii), (iv), (vi), (vii); II - (i), (iii), (v), (viii), (ix); III - (x)
C I - (i), (iv), (vii), (ix); II - (ii), (v), (viii); III - (iii), (vi), (x)
D None of these represents the correct match.

An unknown metal X when placed in copper sulphate solution, red brown pieces of copper fall to the bottom of the test tube. When metal X is placed in aluminium sulphate solution, no change is observed. Metal X can be

A Sodium
B Potassium
C Iron
D Calcium.

Match the column I with column II and select the correct option from the codes given below :


A P - (ii), Q - (iv), R - (iii), S - (i)
B P - (i), Q - (iii), R - (ii), S - (iv)
C P - (iii), Q - (iv), R - (i), S - (ii)
D P - (iii), Q - (iv), R - (ii), S - (i)

Read the given statements and select the correct option.
Statement 1 : After harvesting, the stems of the jute plants are tied into bundles and retted (soaked) in water for about 20 days.
Statement 2 : The process of retting softens the tissues and helps to separate the fibres.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.

Study the given food chain.
X → Y → Z
Select the option that identifies herbivore.

AX
BY
CZ
DBoth X and Y

Read the given paragraph and answer the following questions.
Two metal rulers of lengths 30 cm and 60 cm are kept in such a manner that a 30 cm ruler extends about 15 cm over the edge and a 60 cm ruler extends about 30 cm over the edge. Both the ends are flicked. Read the given statements and select the correct option.
Statement 1 : The note heard in the vibration of 30 cm ruler is louder when flicked with larger amplitude.
Statement 2 : Loudness of a sound depends on the amplitude of vibrations.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Statement 1 is false but statement 2 is true.

Which among the following are pesticides?

Read the given statements and select the correct option.
Statement 1 : A man carrying a bucket of water and walking on a rough level road with a uniform velocity does no work while carrying the bucket.
Statement 2 : The work done on a body by a force (F) in giving it a displacement (S) is defined as W = . = FS cos , where is the angle between vectors and .

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.

The given figure represents the location of various endocrine glands in human body.

Identify the glands marked as P, Q, R, S and T and select the incorrect statement regarding these.

A Gland P secretes the hormone thyroxine, which regulates growth and metabolism.
B Gland Q secretes the hormones corticosteroids and adrenaline, which regulate breathing, heart rate, carbohydrate metabolism and mineral balance.
C Glands S and T secrete the hormones which control secondary sexual characters in females and males respectively.
D Gland R secretes the hormone insulin, whose increased concentration leads to diabetes.