An iron needle sinks in water but a ship floats, on what principle is this based?
(A) Pascal's principle
(B) Principle of Archimedes
(C) Law of Gravitation
(D) None of these
Hence, according to Archimedes' principle, the upthrust is more than the weight of the ship. That is why the iron ship floats in water.
The unit of which of the following is not newton-metre?
(A) Force
(B) Energy
(C) Work
(D) kinetic Energy
Which of the following is not a unit of heat?
(A) Calorie
(B) Phon
(C) Joule
(D) Kcal
The correct answer is Phon. Phon is not a unit of Heat.
If the electrical resistance is to be reduced, then the number of resistors should be connected with
(A) Mala (Series)
(B) Parallel
(C) Mixed system
(D) None of These
When resistors are connected in parallel, more current flows from the source than would flow for any of them individually, so the total resistance is lower.
Bernoulli's theorem is based on?
(A) on energy conservation
(B) on conservation of momentum
(C) on conservation of charge
(D) none of these
Which of the following does not have kinetic energy?
(A) fired bullet
(B) Spring energy
(C) moving hammer
(D) flowing water
Spring energy is the energy stored in a spring when it is expanded or contracted by using an external force. This is stored as elastic potential energy and is not a form of kinetic energy.
When milk is churned, the butter separates from it, what is the reason for this?
(A) Gravitational force
(B) Frictional force
(C) Centrifugal force
(D) Heat
The amount of buoyancy obtained by a solid partially or fully immersed in a liquid depends on?
(A) on the amount of liquid displaced by the solid
(B) on the weight of the solid
(C) on the mass of the solid
(D) none of these
Archimedes' principle states that : "The upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the volume of the fluid that the body displaces."
The reason why a needle floats on top of the water is?
(A) Surface tension
(B) Adhesion
(C) Cohesion
(D) Capillarity
It is due to the surface tension of the liquid.
If the length of the pendulum is made four times, then the time of swing of the pendulum?
(A) Decreases
(B) Becomes Four Times
(C) Becomes One Fourth
(D) Doubles
Therefore we can say that time period is directly proportional to square root of length of the pendulum. Therefore as the length of the pendulum becomes four times, the time period becomes the 2 times.
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