Question

1) An object moves with uniform positive acceleration. Its velocity-time graph will be
a) A straight line parallel to time axis
b) A straight line inclined at an obtuse angle to the time axis
c) A straight line inclined at an acute angle to the time axis
d) None of these
2) Which one of the following is not the unit of energy?
a) joule b) kilowatt hour c) kilowatt d) None of these

Answer 1

Answer:

1.c)A straight line inclined at an acute angle to the time axis.

2.c) kilowatt

Explanation:

1. For an object moving with uniform positive acceleration, the graph shows an straight line as this is uniform acceleration. Acute angle of the graph shows the positivity of the uniform velocity.

Hope it will help you...

Answer 2

Answer:

1) The correct answer is option C

2) The correct answer is option C

Explanation:

1) The movement of development of velocity is identified as acceleration concerning time. Thus, if the bit moves with uniform velocity (i.e. its velocity is constant), the acceleration of a bit is zero.

• If a displacement-time graph is a good line turned to the time axis at an acute angle, it suggests that the angle of the slider or velocity of the body is non-zero.
• Accordingly, the organization is moving away from the origin point with uniform velocity.
• In a distance-time graph, the slope of the line is similar to the speed of the object. The higher the gradient the faster the object is traveling.
• The graph will be a moral line that has been passing through the origin and incline at $45^{0}$ .

2) Hint: Use the relation between energy and power.

Explanation :

If Watt is a unit of power then kilowatt is also the unit of power.

Work done = Force ×× Distance = Newton - meter, Therefore it is the unit of Work or Energy.

Energy = Power × time = kilowatt-hour, in fact, it is the commercial unit of Energy.