pH of biogas is between — a. 6.5 to 8 b. 8 to 10 c. 3 to 4 d. 12 to 14

pH of biogas is between —
a. 6.5 to 8
b. 8 to 10
c. 3 to 4
d. 12 to 14
by

1 Answer

Answer :

a. 6.5 to 8
by

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pH scale ranges from – (1) 0 - 7 (2) 8 - 14 (3) 0 - 14 (4) None

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Last Answer : 0 – 14

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A cuboid shaped wooden block has 6 cm length, 4 cm breadth and 1 cm height. 12. Two faces measuring 4 cm x 1 cm are coloured in black. 13. Two faces measuring 6 cm x 1 cm are coloured in red. 14. Two faces measuring 6 cm x 4 cm are coloured in green. 15. The block is divided into 6 equal cubes of side 1 cm (from 6 cm side), 4 equal cubes of side 1 cm(from 4 cm side). How many cubes will have 4 coloured sides and two non-coloured sides ? (a)8 (b)4 (c)16 (d)10

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Anil after travelling 6 km towards East from his house realized that he has travelled in a wrong direction, lie turned and travelled 12 km towards West, turned right and travelled 8 km to reach his office. The straight distance of the office from his house is: (A) 20 km (B) 14 km (C) 12 km (D) 10 km

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19 + (12 ÷ 4 × (240 × 1 ÷ 180)) × 6 ÷ (101 + 98 ÷ 7 - 113) – (7 ÷ 2 + 14 – 3.5 – 9 × 8.5) × 4 a) 201 b) 241 c) -241 d) -281 e) 281

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The permissible pH value for public water supplies may range between (A) 4.5 to 5.5 (B) 5.5 to 6.5 (C) 6.5 to 8.5 (D) 8.5 to 10.5

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Last Answer : (C) 6.5 to 8.5

The concentration of (H+) ions is 4 x 10-5in a solution. Then pH of the solution will be (Given log 4 = 0.6) (A) 4.4 (B) 5.6 (C) 8.4 (D) 2.4

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Last Answer : (A) 4.4

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Last Answer : a) 10.5 cm x 16.5 cm & 12 cm x 18.5 cm

The average age of 30 students in a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. The average of the remaining students is : a) 8 years b) 10 years c) 12 years d) 14 years e) 15 years

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Last Answer : Let it be x . Then : 5×10+5×14+20×x=30×12 20x=360-120 or 20x=240 or x = 12 Answer: c)

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Last Answer : Given ABCD is a quadrilateral having sides AB=6cm, BC=8cm, CD=12cm and DA=14 cm. Now. Join AC. We have, ABC is a right angled triangle at B. Now, AC2=AB2+BC2 [by Pythagoras theorem]Now, AC2=AB2+BC2 ... =24(1+6-√)cm2=24+246=24(1+6)cm2 Hence, the area of quadrilateral is 241+6-√−−−−−−√cm2241+6cm2 .

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Gas is enclosed in a cylinder with a weighted piston as the stop boundary. The gas is heated and expands from a volume of 0.04 m^3 to 0.10 m^3 at a constant pressure of 200kPa.Calculate the work done by the system.  A. 8 kJ  B. 10 kJ  C.12 kJ  D.14 kJ Formula: W = p(V2-V1)

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Last Answer : 12 kJ