وہ کونسا فعل ہے جب تک
فاعل کے علاوہ کوئی اور اسم یا صفت اس کے ساتھ نہ ملے، وہ بات کو مکمل نہیں کرتا؟
A) فعل ناقص
B) فعل تام
C) فعل لازم
D) فعل اضطراری
Chlorofluorocarbons
are the compounds which contain:
A) Chlorine
B) Fluorine
C) Carbon
D) All of these
Explanation: Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine. They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants.
Carks on roads occur due to:
A) Changes in temperature
B) Contraction
C) Expansion
D) All of these
Seed coat outer layer is called?
A) Plumule
B) Radicle
C) Testa
D) Tegmen
Explanation: A seed coat protects the internal parts of a seed. The seed coat has two layers. The outer layer is thick and known as the testa. The inner layer is thin and known as tegmen.
Which of the following is/are true about the functions of cotyledons?
A) They protect the baby plant
B) They provide food to embryo
C) Both (A) & (B)
D) None of these
Which of the following gas used in fire extinguisher?
A) Nitrogen
B) sulphur
C) Carbon dioxide
D) Hydrogen
Explanation: Carbon dioxide (CO2) is stored in extinguishers in the liquid phase. It vaporizes when released thereby smothering a fire by excluding the air (oxygen) needed for combustion.
