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Q:

Skating on ice is possible because 

A) the surface of ice is smooth B) ice is cold
C) the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water D) the pressure on the ice due to skate raises its melting point
 
Answer & Explanation Answer: C) the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

Explanation:

Here is a case of  lowering of melting point of ice with increase of pressure

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Q:

Ultrasonic waves are used for stirring liquid solutions because they 

A) do not produce noise during the operation B) are easy to produce
C) can produce perfectly homogeneous solutions D) do not produce chemical reactions in the solution
 
Answer & Explanation Answer: C) can produce perfectly homogeneous solutions

Explanation:
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Q:

Pieces of camphor placed on water move about rapidly. This is because of

A) diffusion B) viscosity
C) surface tension D) capillarity
 
Answer & Explanation Answer: C) surface tension

Explanation:

The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. The stronger pull exerted by the uncontaminated portion of water brings about a movement of the surface and the camphor particles are carried along with it. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.

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Q:

No current will flow between two charged bodies if they have the same 

A) resistance B) charge
C) potential D) charge/ potential ratio
 
Answer & Explanation Answer: C) potential

Explanation:

An electric charge always flows from a body at higher potential to a body at a lower potential irrespective of the amounts of charges contained in them. In the question , no current flows. So there is no potential difference. 

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Q:

Due to an acceleration of 1  m/s2, the velocity of a body increases from 5 m/s to 10 m/s in a certain period. Find the displacement (in m) of the body in  that period.

 

A) 125 B) 37.5
C) 62.5 D) 75
 
Answer & Explanation Answer: B) 37.5

Explanation:
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9 14318
Q:

Is B2+ Paramagnetic or Diamagnetic?

Answer

B2+ is a Paramagnetic. 


The filled orbitals are σ(1s)22, σ∗(1s)22, σ(2s)22, σ∗(2s)22. The half-filled orbitals are π(2pxx) and π(2pyy). Since it posses 2 unpaired electrons, it is Paramagnetic in nature.

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Q:

What is the SI unit of pressure

A) Pascal B) Dyne
C) Newton D) Jule
 
Answer & Explanation Answer: A) Pascal

Explanation:
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Q:

Ball bearings are used in cycles, scooters etc to

A) Increase the friction between the wheel and the axle B) Reduce the friction between the wheel and the axle
C) Reduce the friction between ground and the whee D) None of the above
 
Answer & Explanation Answer: B) Reduce the friction between the wheel and the axle

Explanation:
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