JEE Main Test 10

Result

JEE Main Test 10

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

Read the following statements

(i) 12300 has only 3 significant digits
(ii) 1.2300 × 10⁴ has only 5 significant digits
(iii) 0.012300 × 10⁶ has only 3 significant digits
(iv) all trailing zeroes are non significant digits

Correct statements are

A
(i), (ii)

B
(i) and (iv)

C
only (iv)

D
(i) and (iv)

Solution

Statement (i) and (ii) are correct. For the third statement, the number of significant digits is 5 as the number is expressed in a similar fashion as the second statement. For the last statement, trailing zeros are sometimes significant, like in the case of the statement (ii).
Hence, only (i) and (ii) are correct statements.
Question 2
4 / -1

The coagulation of 100 ml of a colloidal sol of gold is completely prevented by addition of 0.25 g of a substance ‘X’ to it before adding 10 ml of 1% NaCl solution. The gold number of ‘X’ is

A
0.25

B
25

C
250

D
2.5

Solution

250 mg of X is present in 100 ml of colloidal sol of gold. By definition, gold no. of X is that amount of it in mg which is present in 10ml, of colloidal gold solution. Hence in 10ml, the amount of X present is 25 mg which is the gold number of X.