Welcome to your physics 2009
2.
The range of cannon-ball fired horizontally from a laboratory table is equal to 8/3 times the height of the table. What is the direction of velocity vector of the projectile as it strikes the ground?
3.
Galileo carried out a �thought� experiment on motion. The line between A and B represents a surface and the center of the ball is placed at A. what would happen in each of the three situations shown in the figure below, without friction when the ball is released?
4.
A uranium atom initially at rest has a mass of 2 units and spontaneously disintegrated into two fragments. One of the fragments has a mass of 0.8 units and moves at a speed of 24m/s as shown in figure below. What is the speed of the second fragments?
5.
A 1kg object explodes and breaks up into three pieces. One piece has a mass of 400g and has a velocity of (15i + 10j)m/s. a second piece has a mass of 250g and has a velocity of (25i � 10j)m/s. What is the velocity of the third piece?
6.
Which of the following statements is not correct?
7.
A spring with a spring constant of 300N/m is stretched 20cm in 2 seconds. What is the power applied to stretch the spring?
8.
A 50KW machine is used to lift heavy objects to the top of a building under construction. If this machine is replace with a new machine of 100KW power, then which of the following statements is not true about the new machine?
9.
Which of the following is correct about a work done for dissipative force?
10.
A disk of radius R with uniform distribution of mass M rotates about an axis perpendicular to its plane at the rim with angular speed ω the moment of inertia of the disc about the axis through the center is1/2MR2. What is the kinetic energy of the disk?
11.
A pulley is rotating at a frequency of 20rev/min. a motor speeds up the wheel so that 30s later the frequency of the motion is 60rev/min. How far a point on the pool 0.30m from its center will has travelled during that period?
12.
A block of mass m=10kg placed on a frictionless incline plane connected to mass m2=15kg using a string of negligible mass passing over a pulley of moment of inertia I=0.25kgm2 and radius R=10cm as shown in the diagram. What is the torque on the pulley?
13.
Which of the following statements is correct about the first condition of equilibrium?
14.
A 4m long uniform board of mass 10kg hinged on the ground at one end is hanging by a string at the other end. A block of mass 8kg is placed at 1m from the hinge on the ground as shown in the diagram below. What is the tension in the string?
15.
Which of the following refers to the definition of strain as a ratio?
16.
Which of the following is the application of Pascal�s law?
17.
A large (very large in height and cross-section) water open at the top has a small hole through its side near the bottom. To what height should the water be filled, to double the speed of water that flow out of the hole when it was filled to a height h?
18.
If a precision of surveyor measured a distance of 500 meters /between two points in a village/ using a meter that has centimetre division on it, then what is the measurement result?
19.
From the figures given below, which one of them shows precise but not accurate measurements? T represents the true value.
23.
A cricketer throws a ball vertically upwards with initial speed of 20m/s. How long is it in the air before it returns to the cricketer�s hands?
24.
Abeba walks to school. She walks 1km in 15minutes. She meets her friend Makeda they talk for 5 minutes and then carry on walking to school. They walk 800m in 10minutes. Which of the following displacement time graph shows Abeba�s journey to school?
25.
A fun making boy swings a blinking ball tied to the end of a string in a vertical circle. If the radius of the circle is 0.5m, then what should be the minimum speed of the ball at the bottom of the circle to make a complete circular motion at the top?
26.
The activity of radioactive substance reduces from 2000Bq to 1000Bq in 106 seconds. What is the decay constant?
27.
Which of the following phenomena clearly demonstrates the particle nature of light?
28.
Which of the following statements is correct?
29.
A certain heat engine draws 500cal/s from a water bath at 27°C and rejects 400 calories to a reservoir at a lower temperature. What is the efficiency of this engine?
30.
Three metals are in contact and in thermal equilibrium. The metals have different specific heat capacity. What can be concluded about the temperature of the metals?
31.
Metal A has a coefficient of linear expansion that is three times the coefficient of linear expansion of metal B. How does their coefficient of areal expansion, Y, compare?
32.
On an unknown scale x, the ice point temperature is 50°x and the steam-point temperature is 200°x. If the temperature is 60°C, then what is the reading in °x?
33.
A block of mass 5kg hanging at the end of spring scale is totally submerged in a breaker of water. The beaker is large enough to avoid overflow of water. If the density of the block is 2.5 x 103kg/m3, then what is the reading of the scale?
34.
An electric generator has a coil of 400 turns and cross-sectional area 5m2 rotating at angular frequency 0.524 rad/s in a uniform magnetic field of 0.2T, what is the induced e.m.f produced from the electric generator in each second?
35.
The primary coil of a transformer is connected to a battery, a resistor, and a switch. The secondary coil is connected to an ammeter. What does the ammeter show when the switch is thrown closed?
36.
Which of the following statement is correct?
37.
The induced electromotive force in a current carrying coil placed in a magnetic field does not depend on which of the following?
38.
A positively charged particle of charge q=3.2 x10-19C is moving parallel to x-axis with speed 1000m/s in a magnetic field of 0.5T parallel to y-axis as shown in the diagram below. What is the magnetic force on the charge?
39.
A charged particle moves perpendicular to a uniform magnetic field. Which statement is correct about the motion of the particle?
40.
Which of the following is not correct about magnetic field?
41.
Which of the following is not correct about the circuit shown below?
42.
A galvanometer of full-scale deflection 10mA is to be converted into a 0 � 10.0A ammeter. If its coil has a resistance of 100Ω, then what value of shunt resistance must be fitted?
43.
If a cell supplies a current of 0.9A when connected to a 2Ω resistor and a current of 0.3A, then what will be the internal resistance of the cell when connected to a 7Ω resistor?
44.
The capacitance of a parallel plate capacitor is 10. If the distance between the plates is halved, keeping all other quantities constant, then what is the new capacitance of the capacitor?
45.
Two positive charges of magnitude 2.4 x 10-9C and 1.6 x 10-9C are separated in air by a distance of 2.0cm. How much electrostatic potential is produced by the two charges at midway between them?
46.
A charge of q1 = -10.0 x 10-9C, q2 = +10.0 x 10-9C and q3 = -2.5 x 10-8C are placed on x-y plane as shown in the figure below. What is the electric force on q3 by q1 and q2?
47.
In a Young�s experiment, there are two slits, rather than one. What do you think the reason?
48.
A light of wavelength 590nm is incident normally on a grating with spacing 1.67 x 10-6m. How many orders of diffraction maxima can be obtained (including the zero order)?
49.
Which of the following statements is correct?
50.
Which of the following is not correct about a simple harmonic oscillator?
51.
Which one of the following indicates the wavelength of a travelling wave?
