Which one among the following elements is polyatomic ?
- A.Sodium
- B.Sulphur
- C.Chlorine
- D.Aluminium
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Answer: B
Which of the following anions has a valency of -3 ?
- A.Nitride
- B.Nitrate
- C.Sulphide
- D.Sulphate
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Answer: A
The mass of 0.5 mole of N2 gas is
- A.7 g
- B.14 g
- C.21 g
- D.28 g
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Answer: B
The chemical reaction : 2AgCl (s)→2Ag (s)+Cl2 (g) takes place
- A.in dark
- B.in sunlight
- C.on heating
- D.under high pressure
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Answer: B
An astronaut whose weight on the Earth is 600 N experiences weightless- ness on International Space Station orbiting around the Earth. It means that
- A.acceleration of the astronaut is zero
- B.normal reaction of the space- station floor on the astronaut is zero
- C.gravitational pull of earth on the astronaut is zero
- D.space station applies a centrifugal force on the astronaut 2 w
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Answer: B
Lightning is due to
- A.The flow of charges between different parts of the cloud
- B.The short-circuiting of charges between the upper and lower surfaces of the cloud
- C.The collection of positively charged particles on the base and collection of negatively charged particles at the top of the cloud
- D.The induction of positive charge on the ground below the negative charge at the base of the cloud
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Answer: A
Which one among the following processes is NOT part of chemical weathering?
- A.Solution
- B.Hydration
- C.Reduction
- D.Thawing
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Answer: D
What is the maximum number of electrons that can occupy the first shell of an atom?
- A.2
- B.4
- C.8
- D.16
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Answer: A
Which one among the following has valency of 3?
- A.Carbon
- B.Oxygen
- C.Nitrogen
- D.Sodium
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Answer: C
Which one among the following is an example of oxidation reaction?
- A.Freezing of water
- B.Dissolving sugar in water
- C.Rusting of iron
- D.Boiling of petrol
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Answer: C
For Aluminium (Al) (atomic number: 13, mass number: 27), which one among the following statements is NOT correct?
- A.Number of electrons present in Al is 13
- B.Number of protons present in Al is 13
- C.Number of neutrons present in Al is 14
- D.The valency of Al is 2
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Answer: D
The elemental composition of diamond is
- A.Carbon and Hydrogen
- B.Carbon and Oxygen
- C.Pure Carbon
- D.Pure Silicon
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Answer: C
Which one among the following is an example of chemical change?
- A.Sublimation of camphor
- B.Melting of ice
- C.Heating of an iron rod
- D.Mixing of NaOH and HCI
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Answer: D
Given below are the four cases in which certain heat transfer is taking place:
1. Ice is melting in a glass full of water
2. Water is boiling in an open container
3. A metal rod is heated in a furnace
4. A cup of coffee is allowed to cool on a table In which of the above cases, the Newton's Law of Cooling is applicable ?
- A.1 only
- B.4 only
- C.1 and 4 only
- D.1, 2 and 3
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Answer: B
Which one of the following is the best shape of a solid metal rod to form the top end of a lightning conductor?
- A.Option A
- B.Option B
- C.Option C
- D.Option D
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Answer: A
The relative atomic mass of boron (which exists in two isotopic forms 10B and 11B) is 10.81. What will be the abundance of 10B and 11B, respectively (consider a sample of 100 atoms)?
- A.19% and 81%
- B.81% and 19%
- C.38% and 62%
- D.62% and 38%
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Answer: A
Match List-I with List-II and select the correct answer using the code given below the Lists:
List-I(Allotrope of Carbon)A. GraphiteB. DiamondC. FullereneD. GrapheneList-II(Property)1. Thinnest and strongest material2. Hardest natural substance3. Very light and strong material4. Soft and slippery material
- A.A - 4, B - 2, C - 3, D - 1
- B.A - 4, B - 3, C - 2, D - 1
- C.A - 1, B - 3, C - 2, D - 4
- D.A - 1, B - 2, C - 3, D - 4
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Answer: A
Which of the following is not a part of compound microscope?
- A.Mirror
- B.Stage
- C.Clip
- D.Retina
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Answer: D
In the human digestive system, which one among the following is the role of the pancreas?
- A.Secretion of surfactants to break up lipid droplets
- B.Storage and regulated release of bile
- C.Secretion of lipase, amylase and protease
- D.Neutralizing stomach acids
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Answer: C
Which one of the following does not apply to sound waves in fluids?
- A.They transport energy
- B.They need a medium to travel
- C.They are transverse
- D.They travel faster in liquids than in gases
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Answer: C
A metallic bob X of mass m is released from position A. It collides elastically with another identical bob Y placed at rest at position B on a horizontal frictionless table. The angle AOB is 30°. How high does the bob X rise immediately after the collision?
- A.To the same height as that of position A on the other side in the same trajectory
- B.To half the height as that of position A on the other side along the same trajectory
- C.The same height at position A
- D.It stops at position B
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Answer: D
Consider the two statements given below:
Statement-1 : Infrared waves are also called heat waves.
Statement-2 : Water molecules readily absorb infrared waves.
Select the correct answer using the code given below :
- A.Both the statements are individually true and Statement-2 is the correct explanation of Statement-1.
- B.Both the statements are individually true, but Statement-2 is not the correct explanation of Statement-1.
- C.Statement-1 is true, but Statement-2 is false.
- D.Statement-2 is true, but Statement-1 is false.
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Answer: A
Water gas is a mixture of:
- A.CO₂ and H₂
- B.CO and H₂
- C.CO₂ and H₂O
- D.CO and H₂O
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Answer: B
Which one among the following compounds has a sweet and fruity smell?
- A.Ethyl alcohol
- B.Acetic acid
- C.Ethyl acetate
- D.Acetophenone
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Answer: C
What is the coordination number of Na⁺ and Cl⁻ ions in NaCl lattice?
- A.6, 1
- B.1, 6
- C.6, 6
- D.5, 5
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Answer: C
