PHY101 Grand Quiz by Junaid

Phy101 Grand quiz file · Sr No. MCQS QUESTION · ANSWER

A body will be in translation equilibrium if: F = 0 ML2T-1

radius of the smaller pipes?

0.23 m

The ultimate strength of a sample is the stress at which the sample Breaks

A stone is thrown up from the surface of earth, the it reaches a maximum height, kinetic energy is equal to: Zero

If the speed of sound is 340m/s a plane flying at 400m/s creates a conical shock wave with an apex half angle of: 58?

The law of inertia was firstly formulated by: Newton Bodies which falls freely under gravity provides good example of motion under: Uniform acceleration

The value of k in coulomb’s law depends upon Medium between two charges Which of the following statement about floating objects correct? The buoyant force equals the object’s weight. Let F1 be the magnitude of the gravitational force exerted on the sun by Earth and F2 be the magnitude of the force exerted on Earth by the sun. Then: F1 is equal to F2

The first condition of equilibrium implies that: F = 0 One revolution is the same as: 2n rad Ali wants to lift a mass of 7.5 kg with constant velocity by a rope that passes through a frictionless pulley which is attached to the ceiling of room. Calculate the tension in the rope by neglecting the mass of the rope. 75 N

The speed of a sound wave is determined by: The transmitting medium A force of 100 N acts upon a body for five second. What will be the change in momentum? 500 NS

Which pair will always have the same magnitude to the rate of change of position? Instantaneous speed and instantaneous velocity A municipal water supply is provided by a tall water tower. Water from this flower to a building. How does the water flow out of a faucet on the ground floor of a building compare with the water flow out of an identical faucet on the second Water flows more rapidly out of the ground-floor faucet. floor of the building? The dot product of vector A with itself is equal to A^2 An elastic collision is one in which: Kinetic energy and momentum are both conserved The center of mass of Earth’s atmosphere is : Near the center of Earth For a body to be in equilibrium under the combined action of several forces. The sum of the torques about any point must equal zero Swimming becomes possible because of: Third law of motion When a wave travels through a medium Energy is transferred at a constant speed Young’s modulus is a proportionality constant that relates the force per unit area applied perpendicularly at the surface of an object to: The fractional change in length

Coulomb’s law is only true for point charges whose sizes are Very small Which of the following statement is true? Weight is a force, mass is a measure of inertia Possible unit of angular momentum are: Kg.m/s2 If the force acting on a body is doubled then the acceleration becomes: Double

Momentum may be expressed in: N.s A man, with his arms at his sides, is spinning on a light frictionless turntable. When he extends his arms: His angular momentum remains the same The approximate value of g at an altitude above Earth equal to one Earth diameter is: 1.1m/s2

Young’s modulus can be used to calculate the strain for a stress that is: Well below the yield strength Unit of distance is: Light year SI unit of time period is________. Second The rate of change of momentum of a body is equal to: Applied force A rocket ship is coasting toward a planet. Its captain wishes to know the value of g at the surface of the planet. This may be inferred by: Observing the ship’s acceleration and correcting for the distance from the center of the planet: A 1-kg block is lifted vertically 1m by a boy. The work done by the boy is about: 10 J

As the wavelength of a wave in a uniform medium increases, its frequency will______. Decrease

Which of the following cases is/are NOT a uniformly accelerated motion? I. A feather falls from a certain height inside a vacuum tube. II. A ball rolls along a frictionless plane at uniform speed. III. A coin falls from a certain height in air but air (ii) only resistance is negligible.

As per coulomb’s law, the force of attraction or repulsion between two point charge directly proportional to the. Product of the magnitude of charges Which of the following statement about completely submerged objects resting on the ocean bottom is correct? The apparent weight of the object depends on the object ‘s density The momentum of an object at a given instant is independent of its: Acceleration

A vector A is added to a vector B. the resultant vector A + B have greatest magnitude when: When vectors A and B are parallel and in the same direction Two sound waves are traveling through a container of unknown gas. Wave A has a wavelength of 1.2 m. wave B has a wavelength of 3.6M. The velocity of wave B must be_____ the velocity of wave A. The same as

Work has dimensions like: Torque Which statement is not true for acceleration? Riding your bike straight down the street at a constant speed

radius of the smaller pipe?

0.23 m

The unit kg.m2/s can be used for: Angular momentum A water tunnel has a circular cross section where the diameter diminishes from 3.6 m to 1.2 m. if the velocity of water flow is 3.0 m/s in the large part of the tunnel, what is the velocity of flow in the smaller part of the tunnel? 27 m/s

What is the angle of projection of projectile, for which its maximum height and horizontal range are equal? A mosquito’s buzz is often rated with a decibel rating of 40 dB. Normal conversation is often rated at 60 dB. How many times more intense is normal conversation compared to a mosquito’s buzz? People try to keep the………… over their feet, in order to feel stable. Centre of gravity

The goal of all scientific inquiry (or scientific method) is: Predicting natural events based on known patterns Before the density of an object can be found, what two measurements are required? Mass and volume

A……………….. vector is obtained by dividing the vector by its magnitude: unit

When two lights are in close proximity to each other, flashing alternately, appear to be one light moving back and forth, it is called: Phi phenomenon