The sky looks blue due to

• Dispersion of Sunlight
• Scattering of Sunlight
• Refraction of Sunlight
• None of these
Correct Option: B  [ Scattering of Sunlight ]

Remark: The scattering of sunlight is a phenomenon that occurs when sunlight interacts with particles or molecules in the Earth's atmosphere, causing the light to change direction and spread out in various directions.

India first atomic device was exploded in 1974 at:

• Bikaner
• Barmed
• Pokhran
• Jaisalmer
Correct Option: C  [ Pokhran ]

Remark: Pokhran is a city in Rajasthan

Gasoline is obtained from crude petroleum by:

• Fractional distillation
• Fractional distillation
• Sublimation
• Evaporation
Correct Option: A  [ Fractional distillation ]

Remark:

A heavy stone appears to be lighter in water. This is due to

• Upward pressure of water
• Downward pressure of water
• Lateral pressure of water
• None of these
Correct Option: A  [ Upward pressure of water ]

Remark: Water creates upward pressure due to the principle of buoyancy, as described by Archimedes' principle.

Which of the following statements is correct ?

• Protons are negatively charged and are present in the nucleus
• Electrons are positively charged and are present in the nucleus
• Electrons are negatively charged and are present in the orbits
• The entire mass of atom is distributed in the orbits.
Correct Option: C  [ Electrons are negatively charged and are present in the orbits ]

Remark:

What makes a lemon sour?

• Tartaric acid
• Oxalic acid
• Citric acid
• Hydrochloric acid
Correct Option: C  [ Citric acid ]

Remark:

Which quantity remains constant in parallel connection of resistance?

• Electric current flow rate
• Potential difference
• Amount of electricity
• Both the potential difference and amount of electricity
Correct Option: B  [ Potential difference ]

Remark:

Muscle fatigue is due to accumulation of

• Carbon Dioxide
• Creatinine
• Lactic acid
• Ethyl alcohol
Correct Option: C  [ Lactic acid ]

Remark:

Iodoform is used as an:

• antipyretic
• analgesic
• antiseptic
• anaesthetic
Correct Option: C  [ antiseptic ]

Remark:

When a sound wave goes from one medium to another, the quantity that remains unchanged is:

• Frequency
• Amplitude
• Wavelength
• Speed
Correct Option: A  [ Frequency ]

Remark: