For a force F acting along the horizontal axis, its horizontal component equals:

• A) 0
• B) 2 F
• C) ½ F
• D) F

Chemical reactivity of a compound can be determined by its ___________.

• A) Polarity of bond
• B) Number of electrons
• C) Bond energy
• D) Number of lone pair

which of the following is the fastest speed

• A) 300 km per minute
• B) 300 millimeters per microsecond
• C) 30,000 km per day
• D) 300 meters per second

Liquids and gases expand on heating, produce:

• A) Convection currents in fluids due to changing densities
• B) Convection currents in fluids due to changing masses
• C) Convection currents in fluids due to constant temperatures
• D) Heat transfer by conduction

In the solution of salt+ water, salt is acting as______.

• A) Insolvent
• B) Solvent
• C) Substrate
• D) Solute

Which of the following is a derived quantity:

• A) mass
• B) force
• C) time
• D) temperature

Two thin lenses of power +6 D and -2 D are placed in contact with each other. Focal length of the combination is:

• A) + 4 m
• B) - 0.25 m
• C) + 0.25 m
• D) - 4 m

The naturally occurring resources of metals are known as__________.

• A) Minerals raw materials
• B) Minerals rocks
• C) Mineral deposit
• D) Mineral ores

The number of maximum electrons in d-sub shell are

• A) 6
• B) 10
• C) 14
• D) 2

What is the purpose of the little hairs inside the nose?

• A) To fight disease
• B) To keep dust out of the lung
• C) They serve no purpose
• D) To tickle the nose and cause sneezes

Friction can be reduced through use of ball bearings because:

• A) ball bearings convert kinetic friction into rolling friction
• B) ball bearings make the surface smooth
• C) ball bearings have no friction of their own
• D) ball bearings make the surface rough allowing better grip

Equations of motion can only use to find the solution of problems for ________.

• A) Motion in straight line
• B) Motion along curved path
• C) Motion along the circular path
• D) All of above

Isotopes are sisters atoms of same elements with similar chemical properties but different ________ .

• A) Atomic weights
• B) Atomic numbers
• C) Atomic volume
• D) Atomic structure

A hydroelectric power plant converts the gravitational potential energy of water to Electric Energy. If 150,000 kg of water flowing down a height of 35m generate 50 MW. The efficiency of the system is

• A) 50 to 55%
• B) 56 to 62%
• C) 93 to 97%
• D) 75 to 85%

Which of the following quantum number explain the shape of sub-shells in atomic orbitals?

• A) Azimuthal quantum number (l)
• B) Principal quantum number (n)
• C) Magnetic quantum number (m)
• D) Spin quantum numbers (s)

The halogen atom which has highest value of electron negativity is ______.

• A) Cl-
• B) I-
• C) F-
• D) Br-

If the pressure of a given gas is held constant its density is inversely proportional to its absolute temperature. We can refer it as another statement of?

• A) Ideal gas law
• B) Avogadro’s’ law
• C) Charles law
• D) Boyle’s law

The gas which is found 78% by volume in air is______.

• A) Cl2
• B) N2
• C) H2
• D) O2

The metal which corrodes rapidly when exposed to atmospheres is________.

• A) Tin (Sn)
• B) Silver (Ag)
• C) Iron (Fe)
• D) Sodium (Na)

Which of the following is not a derived unit:

• A) intensity
• B) Watt
• C) Kelvin
• D) Joule