Welcome to your physics national exam 2011
choose the best answer from the given
alternatives
1.
A grade 11 physics teacher ordered four of his students to measure the length of a class room. He provided them the following length measuring instruments. The instruments are meter rule with millimeter division, Vernier calipers, micrometer screw gauge and meter tape with centimeter scale, but its zero reading is not visible. Which one of these instruments is appropriate for the task?
2.
Which part of a scientific report discusses the accuracy of measurements taken?
3.
Two forces exerted on a block as shown in the figure below.
What is the horizontal component of the net
force?
4.
What is the magnitude of the resultant velocity for a bird tidying first at a speed of 10 m/s North East and then flying to South at a speed of 8 m/s ?
6.
A driver of an automobile travelling at a constant speed of 20 m/s suddenly applies a brake and the automobile comes to rest in 2.0 seconds after skidding for a certain distance, what is the length of the skid distance?
7.
Which of the following is correct about the motion shown in the velocity time graph below?
8.
An object of mass M is set in a vertical circular motion. The tension T from the rope keeps the object in a circular path with speed V. where does the rope experience a maximum tension?
9.
A shell is fired from a gun, whose barrel is inclined at angle to the horizontal. During the flight, the shell explodes in air into fragments. The center of mass of different fragments will follow
10.
A I Sg mass pushed upward along an inclined plane of inclination 30° with constant force F. If the acceleration of the block for this motion is 1.0 m/s* and the plane is assumed to be friction less, what is the magnitude of the constant force F ?
13.
A trolley is set to move on a smooth track that is banked at an angle of 30°. For a trolley moving with a speed 5 m/s to round the curve, what is the radius of the banked surface?
14.
Which of the following is equal to the amount of work required to stop a moving object?
15.
A 1 kg roller coaster is acted on by a 4 N force over a displacement of 2 m in the direction of force and then set free. The roller is moving on a smooth and horizontal surface towards a free end of a spring of constant £, whose other end is fixed on the wall. If the spring is compressed by 20 cm to bring the roller coaster to rest, then what is the value of the spring constant?
16.
In which of the following case is no work done by a dissipative force?
17.
Five beads of equal mass are fixed on a rigid light rod that is free to rotate about a frictionless vertical bearing. The arrangement is such that, four of them are placed at 0.25 in and the fifth one is at 0.5 m from the axis of rotation. The rotational kinetic energy is 144 I when the beads were rotating with angular speed of 48rad/s. what is the mass of each bead?
18.
A thin circular ring of mass II M and radius r and moment of inertia M 2 is rotating about its axis with a constant angular velocity on. Two objects each of mass , are attached gently to the opposite ends of a diameter of the ring. What would be the angular velocity of the wheel?
19.
In a playing room a tumn table of radius 2 m has moment of inertia 250Kgm2 and is rotaling about a functionless vertical axel. When a boy of mass 50Kg stands mear the nim, the system rotates: with angular speed 3rad/s. The boy walks towards the center add stands at 1 m from the are. Whait is the final angular specel of the system?
21.
The rod shown in the figure below is uniform and its weight is 2.8 N. The length of the rod is 3.0 m. Two ropes A and & keep the rod in horizontal position. Rope A is 1.0 m from one end and rope & is at the other end of the rope. What is the calculated value of the tension in rope A ?
22.
Which of the following statement is correct about elastic behavior of materials?
23.
A fluid of unknown density filled in a beaker of 250.0 cm3 . The pressure due to the fluid at the base of the beaker is 2.30 Pa. The base area of the beaker is 102cm2.What is the density of the fluid?
24.
Which of the following statement is correct?
25.
Water flows at a rate of 0.4 litter per second through garden hose of inside diameter 4.0 cm. The nozzle of the hose is a circular opening of diameter 2.0 cm. What is the speed of the water when it emerges? (3=3.14)
26.
How much heat would be absorbed by 2 g of ice at 0O c dropped into water at 0c. to melt it totally to water at 0c ? (Latent heat of melting, L 340, 000 J/Kg )
27.
The direction of heat flow is from:
28.
External force of 220 N applied on a piston of a cylinder containing 1.25 g of ammonia gas more 10 cm as shown m the diagram below. Assuming adiabatic process, what is the rise in temperature of the gas? (Specific heat capacity of ammonia, c=2200 I/Kg°K )
29.
Which of the following statement is connect? (here P is the density of an idea gas, m is the mass of the gas and c is speed of particles)
30.
Which of the following statement is NOT correct?
31.
Which one of the following is not an example of simple harmonic motion?
32.
Travelling wave is given by the equation Y= A COS (k×-∞t), where k is the wave number and ω is the angular frequency. What is the distance that the wave travels in the time t= T/2?
33.
A 50 cm pipe is open at one end and closed at the other end. When air is blow at 150 Hz. What is the velocity of the sound along the pipe?
34.
In Young's double slit experiment, if the slit separation is 1.2 mv and the average spacing of the bright fringes observed on a screen placed 4 away from the source is 2 min. What is the wavelength of the light source?
35.
The colors seen from soap bubbles and oil slicks are a manifestation of thin film interference. What is the cause of this interference?
36.
Two like charges of value 9 are fixed at x=a and x =-a as shown in the diagram below. If a test charge qo is released at y=b, which path will it follow?
37.
Two equal and opposite charges are located along x-axis at -2.0 and +2.0 cm as shown in the figure below. How much would be the electric potential at the origin?
38.
A sheet of polythene and 0.25 mm thick is to be used in a capacitor by sandwiching it between two sheets of aluminum foil. What area must the sheets have if the capacitor is to have a capacitance of 0.5µF ?
39.
A metal rod is measured to have a resistance R. if the same metal rod is stretched to reduce its radius by half without affecting its density, what is its new resistance?
40.
The statement of Kirchhoff’s point rule follows from:
41.
You are given the bridge circuit as shown in the diagram Below. The resistance is used to limit the current in the galvanometer. Which of the following is correct in measuring R4
42.
A current of 5 A flows through the circuit when the switch in the figure below is closed.
What would be the copper wire suspended on the clamp?
43.
what is the expression of the centripetal acceleration of a particle of change q and mass m moving in a uniform magnetic field B on a circle of radius r if B is perpendicular to the particle's direction of motion?
44.
Two long wires of 10 m in length carries a current of 2.0 A and 0.5 A in the same direction. The wires are separated by 4.0 cm. What is the magnetic force that the wires exerted on each other?
45.
Lenz's law in electromagnetic induction follows from which law of conservation?
46.
A rectangular loop of area 0.4 m2 is placed in a magnetic field that is changing at a rate of 100 T/s. If the normal of the loop makes angle 60° with the magnetic field, what is the magnitude of induced em?
47.
The applied ac voltage and the resulting current, in a circuit element, is shown below
What is the circuit element?
48.
A series circuit consisting of 50 Ω resistor and capacitor of capacitive reactance 50Ω are connected to alternating source of voltage (ms) 100 V. What is the average power output and power factor of the circuit?
49.
When ultraviolet light is shone on a clean metal surface the surface will emit electrons. What is the necessary precondition for electrons to be ejected from the metal surface is?
50.
Complete the following equation which represents a nuclear fission reaction. What is the particle represented by X ?
