[PPSC 2017] Work done to stop the motion of car is equivalent to: Thermal Energy K.E. P.E. None of these Answer K.E
[PPSC 2017] Work done in circular motion after complete cycle? Radius is 5m with vehicle having speed of 5m/s. 5J 25J 50J None of these Answer: None of these
[PPSC 2017] Zeroth law is also known as: Law of engines Law of refrigerator Law of thermal equilibrium None of these Answer:Law of thermal equilibrium
[PPSC 2017] Electromagnetic waves have: Positive charge Negative charge both (a) and (b) None of these Answer:None of these
[PPSC 2017] Magnitude of 5N and 7N forces can give the resultant of: 1N 2N 35 N None of these
[PPSC 2017] Change in momentum is independent of Velocity acceleration time None of these Answer: acceleration
[PPSC 2017] Significant Figures in 0.005307 are six four three None of these Answer: four
[PPSC 2017] Tangential acceleration of a rotating body is equal to the product of distance from center and .. ? angular acceleration square of Tangential velocity angular velocity None of these Answer: angular acceleration
[PPSC 2017] The value of ‘g’ at the center of the Earth is? Infinity 9.8 m/s^2 zero None of these Answer: Zero
[PPSC 2017] What is the vector force due to a potential energy U = 1/2kx^2 kx -kx 1/2 kx None of these Answer: -kx
Dyne is to force, as Kyser is to: Viscosity Wave number gravitational acceleration None of these Answer: wave number
Dimensionless quantity out of the following is: Angular velocity Angular Magnification Angular frequency None of these Answer:Angular Magnification
Dimension of Young’s modulus is same as that of Stress Modulus of elasticity Strain/Stress both (a) and (b) None of these Answer: both (a) and (b)
A semi-circle has _ radians while sphere has _ steradians respectively. π, 2π π, 4π 2π, 4π 4π, 2π Answer: π, 4π
The solid angle subtended at the center of sphere is 3 Sr. by an area of 300 cm^2. What is the radius of sphere? 10 cm 20 cm 0.01 cm None of these Answer: 10 cm
An experiment is performed to determine value of ‘g’ repeated for five times: 9.77, 9.81, 9.89, 9.79, 9.86 (in units of m/s^2). The correct statement about this experiment is Precise but not accurate Precise as well accurate Accurate but not precise None of these Answer: Precise as well accurate
Mass of an object has 4% uncertainty. The momentum supplied is 10% uncertain. Total % uncertainty in “K.E.” is 5% 24% 25 % 28% Answer:24%
The time that light takes for one astronomical unit is approximately: 1.3 sec 1 min 8 mins 365.25 days Answer: 8 mins
Dimension analysis does not give us information about whether a physical quantity is a scalar or vector. the shape of the object the dimensional constant Both (A) and (C) All of these Answer: All of these
[PPSC 2022] A free falling body having mass 10 kg moving with 8 m/s hits ground and rebounds with 6 m/s. Find magnitude of the change in momentum? 20 Ns 140 Ns 70 Ns None of these Answer: 140 Ns
If we add all the 7 colours of rainbow (red, yellow, blue, green, orange, violet and indigo), the resultant colour would be? Black White Dark Blue None of these Answer: White
The vector ‘ i + k ‘ is perpendicular to: i – j j – k 2k – 2i None of these Answer: 2k – 2i
cos@(1+tan@) is a(an) Null Vector Unit Vector Direction cosines None of these Answer: Unit Vector
It is easier to roll a stone up a sloping road than to lift it vertical upwards because work done in rolling is more than in lifting work done in rolling a stone is less than in lifting it work done in lifting the stone is equal to rolling it work done in both is same but the rate of doing work is less in rolling Answer: work done in rolling a stone is less than in lifting it
A block of weight W is pulled a distance S along a horizontal table. the work done by the weight is? WS zero WS/g WSg Answer: zero
