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Browse complete papersThe phenomenon which is not involved in the formation of rainbow is
Dispersion
Total internal reflection
Refraction
Diffraction
Correct answer
Dispersion
In the circuit shown below potential at point A is 20 V. The potential in volts at point B is
20
15
25
30
Correct answer
20
Two particles start simultaneously from origin and moves along +ve X-axis. One particle moves with uniform acceleration starting from the rest and second particle moves with constant velocity. The distance between them
Continuously increases
Does not change
First increases, decreases to zero and then increases
First increases, reaches a maximum value and then remains constant
Correct answer
Continuously increases
The products formed during the electrolysis of brine are
Na2SO4, SO2, H2
NaOH, H2, Cl2
NaCl, H2, Cl2
Na2CO3, CO2, H2
Correct answer
Na2SO4, SO2, H2
Which of the following is an ingredient in antacids?
Na2CO3
Na2SO4
NaHCO3
MgSO4
Correct answer
Na2CO3
Identify the metals which do not react either with cold water or hot water from the list given under.
I. Mg
II. Al
III. K
IV. Zn
V. Fe
VI. Na
I, II, VI only
III, IV only
II, IV, V only
II, VI only
Correct answer
I, II, VI only
Which of the following has the lowest pH value?
Blood
Gastric juice
Pure water
Sodium hydroxide solution
Correct answer
Blood
Which ores are generally subjected to roasting in the extraction of metals?
Oxide ores
Sulphide ores
Carbonate ores
Sulphate ores
Correct answer
Oxide ores
The metal lead is present in the ore, X and metal mercury is present in the ore Y. X and Y are respectively
Bauxite, Pyrolusite
Haematite, Galena
Galena, Cinnabar
Cinnabar, Galena
Correct answer
Bauxite, Pyrolusite
The oxide of metal ‘X’ reacts with both hydrochloric acid and sodium hydroxide. What is X?
Na
Mg
K
Al
Correct answer
Na