According to second condition of equilibrium, for a system to be in rotational equilibrium, the torques acting on it must balance. This is true only if the torques are taken about: the center of the system the center of mass of the system any point of the system outside it None of these Answer: the center of mass of the system
Which of the following is a scalar quantity? Electric field Angular Velocity Retardation None of these Answer: Angular Velocity
If d is measured to be 10 cm, and it is measured with the help of an instrument having least count of 0.1 cm. Determine the absolute uncertainty? 0.1 0.1% 5 % None of these Answer: 0.1
Which of the following is correct? Impulse has the same dimension as that of ratio of work done to velocity Force applied is equal to the change of momentum In an adiabatic process, heat is exchanged between system and the surrounding. Dimensional analysis helps in deriving the formulas, including trigonometric functions too. Answer: Impulse has the same dimension as that of ratio of work done to velocity
A football is kicked with an angle θ w.r.t horizontal, the acceleration of projectile at highest point is: Equal to time rate of velocity value at the highest point. Zero Both (A) and (B) None of these Answer: None of these
What is the shape of velocity time graph for constant acceleration? straight line inclined in xy plane straight line parallel to x axis straight line parallel to y axis None of these Answer: straight line inclined in xy plane
How many forces are acting on Air-craft in air? (assuming , un-accelerated, straight-and-level flight) One Two Three Four Answer: Four
For an air-craft to accelerates: Drag force > Thurst Thurst > Drag force Thurst = Drag force None of these Answer: Thurst > Drag force
Mirage is: unequal heating of different parts of the atmosphere depletion of ozone layer in the atmosphere equal heating of different parts of the atmosphere None of these Answer: unequal heating of different parts of the atmosphere
Recoiling of a cannon after firing a shot is an example of: Newton’s 1st Law Newton’s 2nd Law Newton’s 3rd Law None of these Answer: Newton’s 3rd Law
An electric bulb lights out for 60 minutes daily. If the cost of electricity is 10 rupees per unit, and the total cost for a month of 30 days is 100 rupees, determine the Power of bulb? 10 watt 100 watt 1000 watt None of these Answer: None of these
A football is kicked at 45 degree, the maximum height attained by the football is 100m. What will be the range ofr the football? 50m 100m 200m 400m Answer: 400m
An object is at infinite height w.r.t earth, the Absolute P.E. of the object is taken as zero Absolute P.E. is maximum at this infinite height Both (A) and (B) None of these Answer: Both (A) and (B)
The ratio of orbital velocity to the escape velocity is: 1: √2 √2 : 1 1 : 1 None of these Answer: 1: √2
watt-hour is a unit of Power Energy Intensity Does not represent a physical quantity. Answer: Energy
A 5 kg object starting at rest, falls to the ground from a height of 10 m. Just before hitting the earth, what will be the K.E.? if the friction force offered by the air is 1 N. 480 J 490 J 500 J None of these Answer: 480 J
The biggest unit of energy is _ whereas the smallest unit of energy is _ (out of the following) Kilowatt hour, Erg Kilowatt hour, eV Kilowatt hour, Gram calorie watt hour, Erg Answer: Kilowatt hour, eV
The K.E. is 1200 J for a mass 690 kg having momentum _. 1286 kgm^2 12086 kgm^2 2001 kgm^2 None of these Answer: None of these
The angle between centripetal force and centrifugal force, for a body moving in a circle is 90 180 45 degree None of these Answer: 180
A well known fact is that work done by the centripetal force is zero since speed remains constant during circular motion, what about K.E. during the same circular motion? Of course it is zero as well. It remains constant. It does not remains constant. None of these Answer: It remains constant.
A body of mass 50 kg is standing in a lift. What happens to mass of the body when the lift is going up and is about to stop at 3rd floor? Increases Decreases Remains same None of these Answer: Remains same
If the lift moves upward with a deceleration, having a person standing still in the lift, what will happen to the Real weight of the person? Increases Decreases Remains same None of these Answer: Remains same
The ratio of displacement along diameter of circle and total distance along a semi-circle is: 1: π π : 1 1 : 1 None of these Answer: None of these
Bernoulli’s equation was derived in today’s known form, by Daniel Bernoulli first wife of Daniel Bernoulli second wife of Daniel Bernoulli L. Euler Answer: L. Euler
[PPSC 2022] The terms (other than pressure) in Bernoulli equation have the dimension of: Pressure Gradient Velocity Gradient Modulus of Elasticity None of these Answer: Modulus of Elasticity
