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Q:

The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 1st group and the 4th period?

A) 21 B) 17
C) 19 D) 9
 
Answer & Explanation Answer: C) 19

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Q:

Which one of the following elements is essential for the formation of chlorophyll in green plants?

A) Calcium B) Iron
C) Magnesium D) Potassium
 
Answer & Explanation Answer: C) Magnesium

Explanation:

Forms taken up by plants: Mg++ Functions in plants: a part of the chlorophyll molecule -essential in photosynthesis: related to phosphorus metabolism: large quantities found in seed.Mg deficiency symptoms: Mg is mobile, so symptoms occur first in old leaves; A whitish or yellowish striping effect on grasses.

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Q:

Who was the first man to go to space?

A) Yuri Gagarin B) Yuri Rontgen
C) Yuris Cui D) Yuris Mahatinn
 
Answer & Explanation Answer: A) Yuri Gagarin

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Q:

Turquoise is an ore/mineral of

A) Copper B) Manganese
C) Mercury D) Tin
 
Answer & Explanation Answer: A) Copper

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Q:

The atoms of Germanium, Arsenic, Selenium and Bromine contain ...... shells.

A) 3 B) 7
C) 5 D) 4
 
Answer & Explanation Answer: D) 4

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Q:

The common name of hydrogen peroxide is

A) borax B) bleach (liquid)
C) baking soda D) gypsum
 
Answer & Explanation Answer: B) bleach (liquid)

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Q:

The Chemical formula of Ammonium sulphate is

A) NH4SO4 B) (NH4)2SO3
C) NH4SO3 D) (NH4)2SO4
 
Answer & Explanation Answer: D) (NH4)2SO4

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Q:

Which  one  of  the  following  statements  is not correct?

A) The    cathode    rays    originate    from cathode   and   proceed   towards   the anode   in   a   cathode-ray   discharge tube. B) The television picture tubes are nothing but cathode ray tubes.
C) The  cathode  rays  themselves  are  not visible. D) The   characteristics   of   cathode   rays depend  upon  the  nature  of  the  gas present in the cathode-ray tube.
 
Answer & Explanation Answer: D) The   characteristics   of   cathode   rays depend  upon  the  nature  of  the  gas present in the cathode-ray tube.

Explanation:

Cathode ray is a beam of electrons emitted   from   the   cathode   of   a vacuum    tube.    It    is    invisible. Cathode  ray  tubes  are  also  found in     televisions     and     computer monitors.  Since  cathode  ray  is  a beam of electrons and all electrons are  identical,  charge  to  mass  ratio is same for all the gases and does not depend on the nature of gas.

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