What does the slope of a velocity- time represent?
The slope in the velocity-time graph represents the acceleration. The slope is defined as the ratio of change in y-axis... View Article
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The dimensions of instantaneous acceleration is:
The dimension is same as acceleration.
On velocity-time graph when two curves coincide, the objects will have
On velocity-time graph, the point at which two curves coincide will indicate that both the objects have same velocity at... View Article
Choose the right answer from the following
Two identical blocks of iron, one at 10oC and the other at 20oC, are put in contact. Suppose the cooler... View Article
The second law of thermodynamics says
The second law of thermodynamics says coefficient of performance can never be infinite for refrigerator.
The principle of conservation of energy is represented by
For conservative forces, the total mechanical energy (= potential energy + kinetic energy) is constant. The equation shows that the... View Article
The potential energy of a hammer of mass 10 kg, lifted to the height of 10 m is
Potential Energy = mgh = 10 kg x 9.8 ms-2 x 10 m = 980 J
Which of the following is not a unit of energy? (1) joule (2) newton metre (3) kilowatt (4) kilowatt-hour
Answer: (3) kilowatt In physics, we can define energy as the capacity to do work. The SI unit of energy is joules... View Article
Which of the following is not an example of zero work? (1) The work done by the tension in the string, when a body tied with the string move along a circular path (2) When a horse pulls a cart on a level road. (3) The work done by a coolie when he travels on a horizontal platform, with a load on his head. (4)When a person holds some amount of load but, does not move from his position.
Answer: (2) When a horse pulls a cart on a level road Zero work Zero work is defined when force and... View Article
A truck moves at a steady speed on a horizontal road. What is the work done by the road on the truck?
The work is zero because while the truck does have a displacement over time, the force of the road (the... View Article
In a steady state, what happens to the temperature of each part of the rod?
In a steady state, the temperature of each part of the rod is constant but not the same. Steady-state is... View Article
On acceleration-time graph, a horizontal line indicates:
A horizontal line on a acceleration- time graph indicates that object has constant acceleration.
A boy throws up a ball in a stationary lift and the ball returns to his hands in 10 s. Now if the lift starts moving up at a speed of 5 m/s. The time taken for a ball thrown straight up to return to his hands is:
The uniform velocity of the lift does not affect the relative velocity of the ball with respect to the boy.... View Article
Which of the following is an example of heat pump?
A) Evaporator B) Double pipe heat exchanger C) Refrigerator D) None of the above The correct option is C) Refrigerator.... View Article
The second law of thermodynamics can be given as __________.
According to the second law of thermodynamics, for any spontaneous process the entropy of the universe increases.
Kelvin- Planck statement states that
Kelvin- Planck statement states that it is impossible to construct a device that operates on a cycle and produces no... View Article
Which one of the following is not an example of the second law of thermodynamics?
CO2 is exhaled as a by-product of aerobic respiration is not an example of second law of thermodynamics.
Efficiency of Carnot engine working between ice point and steam point would be
Carnot engine was first proposed by Leonard Carnot. It is a theoretical thermodynamic cycle. The cycle that is used for... View Article
In the following x-t graph, which path represents the displacement
Shortest path is displacement.
The graph represents the velocity time for the first 4 seconds of motion. The distance covered is
The distance covered = area under the curve = (1/2) x 4 x 15... View Article
