According to Mendeleef periodic law, properties of elements are the periodic function of which of the following?

• Atomic number
• Atomic mass
• Atomic size
• Density
• option1

X bullocks and Y tractors take 8 days to plough a field. If we halve the number of bullocks and double the number of tractors, it takes 5 days to plough the same field. How many days will it take X bullocks alone to plough the field?

• 30
• 35
• 40
• 45
• option1

Which of the following metals is found in liquid state at room temperature?

• Mercury
• Iodine
• Sulphur
• Carbon
• option1

The vertical columns of modern periodic table are known as which of the following?

• Periods
• Groups
• Shells
• None of these
• option2

Which of the following is the ratio of conc. HCl and conc. HNO3 in Aqua regia?

• 1:1
• 1:2
• 2:1
• 3:1
• option4

Green plants are called as :

• Autotrophs
• Saprophytes
• Parasites
• All of the above
• option1

What is the function of Villi of small intestine?

• Indigestion
• Digestion
• Absorption
• Assimilation
• option3

Krebs-cycle occurs in

• Cytoplasm
• Mitochondria
• Golgi body
• None of these
• option2

The end product of anaerobic respiration in plants is

• Amino acid
• Fatty acid
• ethyl alcohol
• None of these
• option3

In plants, conduction of water takes place by

• Xylem
• Pholem
• Both A and B
• None of these
• option1