Physics-Objective Related Question Answers
851. Examples of vector quanties are?
(1) velocity (2) acceleration (3) force (4) displacement
852. “If there is no external force, a body at rest continues to be at rest and a body in motion continues to move with uniform velocity”. This law is known as?
The Law of Inertia
853. Who proposed the Law of Inertia?
Galileo
854. Who proposed the Laws of Motion?
Isaac Newton
855. The distance travelled in unit time is called?
speed
856. The distance travelled in unit time in a specific direction is called?
velocity
857. Impulse of force?
is the product of the force and the time during which the force acts on the body.
858. The force acting for a very short time?
impulsive force
859. The rate of change of velocity is called?
acceleration
860. The kind of force that opposes relative motion is known as?
Friction
861. The rocket lift - off is based on which law?
Newton’s 3rd Law of Motion
862. The minimum speed which a space craft needs to escape earths gravitational force is known as?
escape speed (escape velocity is wrong because speed is a scalar quantity)
863. The escape speed is?
11.2 km/s or 7 miles /sec.
864. The SI unit of force is?
Newton
865. Which force is needed to change the direction of a moving body?
External unbalanced
866. The momentum of a body depends on what?
Its mass and velocity
867. Why does the cotton wick in an oil-filled lamp keep on burning?
In the cotton wick there are innumerable capillaries in which oil continues to rise.
868. The upward force which liquid act on bodies immersed in it is called?
buoyant force
869. How does the rise of temperature affect surface tension?
The surface tension decreases with rise of temperature.
870. An iron needle slowly placed on the surface of water floats on it because?
of its surface tension
871. A drop of oil is placed on the surface of water. What will happen to it?
It will spread as a thin layer
872. Soap helps in cleaning the clothes because:?
It reduces the surface tension of solution
873. If the diameter of capillary be doubled, the rise of water in capillary will be?
Half
874. When the distance between two bodies increases, the force between them will?
Decrease
875. The acceleration due to gravity is maximum at the?
Poles
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