Science Content (CTET Paper-II Science): Questions 90 - 92 of 148

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Question number: 90

» Science Content » Basic Chemistry

Appeared in Year: 2011

MCQ▾

Question

A man goes door to door posing as a goldsmith. He promises to bring back the glitter on dull gold ornaments. An unsuspecting woman gives a set of gold bangles to him which he dips in a particular solution. The bangles sparkle but their weight has considerably reduced. The solution used by the impostor probably is (June)

Choices

Choice (4) Response
a.

Conc. HCl

b.

A mixture of conc. HCl and conc. HNO3

c.

Dil. HCl

d.

Conc. HNO3

Question number: 91

» Science Content » How Things Work

Appeared in Year: 2011

MCQ▾

Question

LED and CFL are very commonly used as sources of light in homes. Which of the following statements is true? (June)

Choices

Choice (4) Response
a.

LED and CFL are equally good

b.

LED is better because CFL contains toxic materials

c.

CFL is better because LED contains toxic materials

d.

Neither of them is good because both contain toxic materials

Question number: 92

» Science Content » Natural Phenomena

Appeared in Year: 2011

MCQ▾

Question

Green plants appear to release oxygen instead of carbon dioxide into the atmosphere during the daytime because (June)

Choices

Choice (4) Response
a.

Green plants respire only during the nighttime

b.

Green plants respire during the daytime but are involved in photosynthesis during the nighttime

c.

The rate of photosynthesis is higher than the rate of respiration during the daytime

d.

Green plants do not respire during the nighttime

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