Round Class 11 (Maths)Science Quiz

A wire of resistance 20Ω is bent in the form of a circle. What is the resistance between two diametrically opposite points?

• 5Ω

• 10Ω

• 20Ω

• 40Ω

A compound X on reaction with sodium gives a colorless gas and forms Y. Y on oxidation gives Z, a compound used in vinegar. X is:

• CH₃OH

• C₂H₅OH

• CH₃COOH

• HCOOH

A student connects three resistors of 2Ω, 4Ω, and 6Ω in parallel. What is the total resistance of the combination?

• 12Ω

• 1Ω

• 1.09Ω

• 5Ω

Which hydrocarbon can undergo both substitution and addition reactions under specific conditions?

• Ethane

• Ethene

• Benzene

• Methane

A power of 5kW is transmitted at 220V. What is the current through the transmission line, and what happens to power loss if voltage is doubled?

• 22.73A, reduced by 1/4

• 45.45A, reduced by 1/2

• 18.18A, same loss

• 15A, doubled loss

Which part of the eye contains the maximum concentration of cone cells for detailed color vision?

• Optic nerve

• Cornea

• Fovea

• Retina

When NaOH is added to ethanoic acid in a titration, the end-point is detected using which indicator and what color change?

• Methyl orange: Red to yellow

• Phenolphthalein: Colorless to pink

• Litmus: Blue to red

• Phenolphthalein: Pink to colorless

A student adds a few drops of universal indicator to solution X and it turns purple. What is the likely pH of X?

• 7

• < 4

• > 11

• 5

The magnetic field at the center of a current-carrying circular loop is:

• Inversely proportional to current

• Directly proportional to square of current

• Directly proportional to current and inversely to radius

• Independent of radius

Which among the following compounds cannot be prepared via the saponification process?

• Ethanoic acid

• Sodium salt of fatty acid

• Glycerol

• Ketone