Q. 21 Frictional force acts in

A) the opposite direction of the motion

B) the same direction as the motion

C) upward direction

D) all the directions

✔ the opposite direction of the motion
View Explanation

Q. 22 Which subatomic particle has a positive charge?

A) Neutron

B) Proton

C) Ion

D) Electron

✔ Proton
View Explanation

Q. 23 Tetraethyl lead is used as

A) Gasoline additive

B) Fire extinguisher

C) Pain killer

D) Mosquito repellent

✔ Gasoline additive
View Explanation

Q. 24 Which of the following metal is generally used for making filaments of bulb?

A) Ag

B) W

C) Rh

D) Fe

✔ W
View Explanation

Q. 25 What happens when two atoms form a chemical bond?

A) The atoms share or transfer electrons

B) Two atoms fuse together to form a chemical bond

C) Like charges in the atoms cause them to stick together

D) A chemical bond forms when two atoms transfer or share protons to achieve a stable nucleus

✔ The atoms share or transfer electrons
View Explanation

Q. 26 Which type of fault is under compression?

A) normal

B) shear

C) strike-slip

D) reverse

✔ reverse
View Explanation

Q. 27 The most abundant of the rare gases i ?

A) Argon

B) Helium

C) Nitrogen

D) Neon

✔ Argon
View Explanation

Q. 28 Food wrapped in news paper is likely to get contaminated by

A) Alluminium

B) Magnesium

C) Copper

D) Lead

✔ Lead
View Explanation

Q. 29 At what temperature do the Fahrenheit and celcius scales give the same reading?

A) 32 degreees

B) 212 degrees

C) 0 degreees

D) -40 degreees

✔ -40 degreees
View Explanation

Q. 30 Heat is associated with

A) K.E of orderly motion of molecules

B) K.E of random motion of molecules

C) None of these

D) Total K.E of random and orderly motion of molecules

✔ K.E of random motion of molecules
View Explanation

Q. 31 Fat can be seperated from milk in a cream seperator because of :

A) Gravitational Force

B) Cohesive Force

C) Centrifugal Force

D) Centripetal Force

✔ Centrifugal Force
View Explanation

Q. 32 Nucleons are

A) neutrons and electros

B) protons and neutrons

C) protons, neutrons and electrons

D) protons and electrons

✔ protons and neutrons
View Explanation

Q. 33 If a barometric reading is falling, this usually indicates what

A) Decreasing pressure

B) Increasing pressure

C) None

D) No pressure

✔ Decreasing pressure
View Explanation

Q. 34 Where does hydroelectric energy come from?

A) Water

B) Air

C) All of the above

D) Solar

✔ Water
View Explanation

Q. 35 In atomic reactors,graphite is used as

A) fuel

B) lubricant

C) moderator

D) linear of the ractor

✔ moderator
View Explanation

Q. 36 Which among the following noble gas has highest molar mass?

A) Ne

B) Kr

C) Xe

D) Ar

✔ Xe
View Explanation

Q. 37 Which of the following is not a vector quantity?

A) velocity

B) speed

C) displacement

D) torque

✔ speed
View Explanation

Q. 38 In fireworks, the green flame is produced because of

A) Potassium

B) Sodium

C) Mercury

D) Barium

✔ Barium
View Explanation

Q. 39 The speed of light will be minimum while passing through

A) vaccum

B) water

C) glass

D) air

✔ glass
View Explanation

Q. 40 SI unit of equivalent conductance

A) Siemens m2/equivalent

B) ohm/cm

C) mho/cm

D) Siemens/equivalent

✔ Siemens m2/equivalent
View Explanation
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