DSSSB PRT MATHS QUIZ 12

Question 1:

Quiescent type sedimentation tank is the type of tank in which flow of tank water is completely stopped for some hours. Detention time of this tank is

24 hours

48 hours

72 hours

12 hours

Question 2:

The three successive discount $5 \%, 12 \%, 33 \frac{1}{3} \% $ is equivalent to:

$41.23 \%$

$43.5 \%$

$44.26 \%$

$32.8 \%$

Question 3:

Madhu buys some pens for Rs 15 a dozen and an equal number of different pens for Rs 12 a dozen. He sells all for Rs 16.50 a dozen and makes a profit of Rs 150. How many dozens of pens did he buy altogether?

40

50

20

55

Question 4:

In 156 kg mixture of sand and cement, percentage of cement is 45%. How much sand (in kg) should be added in the mixture so that the percentage of cement becomes 39% in the total mixture?

25 kg

24 kg

26 kg

28 kg

Question 5:

Perimeter of a square $A$ is $60 \sqrt{2} \mathrm{~cm}$. What is the area of square B whose side is equal to the diagonal of square A? (in $\mathrm{cm}^{2}$ )

450

$240 \sqrt{2}$

900

3600

Question 6:

The strength of a salt solution is $\mathrm{p} \%$ if $100 \mathrm{ml}$ of the solution contains $\mathrm{p}$ grams of salt. If three salt solutions $A, B, C$ are mixed in the proportion 1 $: 2: 3$, then the resulting solution has strength $20 \%$. If instead the proportion is $3: 2: 1$, then the resulting solution has strength $30 \%$. A fourth solution, $D$, is produced by mixing $B$ and $C$ in the ratio $2: 7$. The ratio of the strength of $D$ to that of $A$ is

$3: 10$

$1: 3$

$2: 5$

$1: 4$

Question 7:

A train moves with a speed of $36 \mathrm{~km} / \mathrm{h}$. Its speed in meter per second is :

$5 \mathrm{~m} / \mathrm{s}$

$15 \mathrm{~m} / \mathrm{s}$

$12 \mathrm{~m} / \mathrm{s}$

$10 \mathrm{~m} / \mathrm{s}$

Question 8:

‘A’ is 40% less efficient than ‘B’ who can do the same work in 50% less time than ‘C’. If A and B together can complete 60% of the work in 120 days, then in how many days 90% of the work can be completed by B and C together?

192 days

200 days

213 days

208 days

Question 9:

Amlesh, Bablu, Chandan, Dinesh and kamlesh are five persons. The weight of Amlesh, Bablu and Chandan is $90 \%, 112 \%$ and $94 \%$ respectively of the average weight of all five. The ratio of weight of Dinesh and kamlesh is $5: 12$. The difference between the weight of Dinesh and kamlesh is $168 \mathrm{~kg}$. What is the average weight of all the five persons?

$184 \mathrm{~kg}$

$190 \mathrm{~kg}$

$200 \mathrm{~kg}$

$220 \mathrm{~kg}$

Question 10:

What is the value of $x$ if, $\frac{10}{3}: x:: \frac{5}{2}: \frac{5}{4} ?$

$\frac{8}{3}$

$\frac{5}{3}$

$\frac{10}{3}$

$\frac{5}{4}$