Domestic cooking gas consists of mostly:

• Methane and ethane
• Liquifed butane and isobutane
• Ethylene and carbon monoxide
• Hydrogen and acetylene
Correct Option: A  [ Methane and ethane ]

Remark:

The speed of light will be minimum while passing through :

• Glass
• Vacuum
• Air
• Water
Correct Option: A  [ Glass ]

Remark:

If a sample of soil is found to have a pH value of 8.25, it is:

• acidic
• neutral
• alkaline
• None of the above
Correct Option: C  [ alkaline ]

Remark:

The addition of gypsum to Portland cement helps in:

• increasing the strength of cement
• rapid setting of cement
• preventing rapid setting of cement
• reducing in the cost of cement
Correct Option: C  [ preventing rapid setting of cement ]

Remark:

The study of hair and its diseases is known as:

• Penology
• Trichology
• Penology
• Pomology
Correct Option: B  [ Trichology ]

Remark:

Thorium and Beryllium are

• Metallic minerals
• Earth material
• Atomic minerals
• Precious metals
Correct Option: C  [ Atomic minerals ]

Remark: Atomic minerals include mainly minerals containing uranium, thorium, rare metals, viz. niobium, tantalum, lithium, beryllium, titanium, zirconium, and rare earth elements (REEs) containing uranium and thorium as well as beach sand minerals.

A transformer is used to :

• Increase or decrease D.C voltage
• Increase or decrease A.C voltage
• Convert A.C to D.C
• Convert D.C into A.C
Correct Option: B  [ Increase or decrease A.C voltage ]

Remark:

In coriander the useful parts are:

• roots &leaves
• leaves & flowers
• leaves & dried fruits
• flower& dried fruits
Correct Option: C  [ leaves & dried fruits ]

Remark:

Which one of the following is a chemical change ?

• Burning of candle
• Melting of wax
• Vapourisation of water
• Magnetising of Iron
Correct Option: A  [ Burning of candle ]

Remark:

The disease caused due to lack of antidiuretic hormone (ADH):

• Diabetes insipidus
• Diabetes mellitus
• Grave's disease
• Cushing's disease
Correct Option: A  [ Diabetes insipidus ]

Remark: