In which year Russia attacked Afghanistan.
A) 1981
B) 1980
C) 1977
D) 1979
Explanation: The Soviet Union invaded Afghanistan on December 27, 1979, in an operation called "Operation Storm-333." This invasion marked the beginning of the Soviet-Afghan War, which lasted for almost a decade until the Soviet forces withdrew in 1989.
لڑکی،گھوڑی اور مرغی ۔۔۔۔ مونث کی مثالیں ہیں۔
A) حقیقی
B)غیر حقیقی
C) سماعی
D) ان میں سے کوئی نہیں
" نظم و ضبط" قواعد کی رو سے کون سا مرکب ہے؟
A) مرکب توصیفی
B) مرکب عطفی
C) مرکب جاری
D) مرکب اضافی
Chromosomes, gene
and _________ are the basic of heredity.
A) Nucleotide
B) Nucleoside
C) Nucleosome
D) DNA
Explanation: DNA, genes and chromosomes work together to make you who you are. Chromosomes carry DNA in cells. DNA is responsible for building and maintaining your human structure. Genes are segments of your DNA, which give you physical characteristics that make you unique.
The colour of methyl orange in Alkali is:
A) Red
B) Blue
C) Deep blue
D) Yellow
Explanation: Methyl orange is an indicator. It is used frequently in titrations. It changes the colour according to the pH of the solution. The colour of the methyl orange in reddish orange in acidic conditions and turns yellow in alkaline condition.
Electric fire alarm work on the principle of…..
A) Contraction
B) Heat transfer
C) Expansion
D) Conduction
Explanation: This fire alarm uses the fact that different solids expand by different amount of heating. The alarm contains two metal strips, one of the iron and other of brass, firmly bolted together. Brass expands more on heating, therefore the bimetallic strip bend on the side of iron upon heating and the circuit is completed. Hence, the fire alarm bell rings.
