Welcome to your Physics 2005
1.
Which of the following is correct about the meaning of Photon?
2.
Consider a series RC circuit for which R = 1.0MΩ C = 5μ F and ε = 30V. What is the time constant of the circuit and the maximum charge on the capacitor after the switch is closed respectively?
3.
What is the direction with which a fish must push the water with its fins in order to propel eastward?
4.
Suppose two molecules of different mass are kept at the same temperature. Which one of the following statements is NOT true?
5.
One person drops a ball from the top of a building while another person at the bottom observes its motion. The two people disagree on which of the following?
6.
Two non-zero vectors where c is a scalar. If the two vectors have opposite directions, then one of the following is true about c?
7.
On which of the following does the induced emf in a coil NOT depend when a magnet is inserted into it?
8.
A wave have a speed of 50m/s and a wavelength of 25,000m. What is the frequency of the wave?
9.
An oscillating system is used to create a succession of wave on a water surface. The rate of wave generation is one every 0.33 seconds. What is the period of these wave?
10.
A vector that represents the position of an object in relation to another object is called
11.
In a reversible thermodynamic process, the system
12.
Points A and B are each a distance d from each of two equal and opposite charge as shown below. What will be the work required to move a negative charge q from A to B?
13.
An air-filled parallel �plate capacitor has a capacitance of 1Pf. The plate separation is then doubled and a wax dielectric is inserted, completely filling the space between the plates. As a result, the capacitance becomes 2 Pf. What is the dielectric constant of the wax?
14.
A step-up transformer is used to
15.
A 220-V power line is protected by a 15-A fuse. What is the maximum number of �220V, 500W� light bulbs that can be operated at full brightness from this line?
16.
The coordinate of a particle in meters is given by X(t) = 25t � 3t2, where the time t is in seconds. At what value of t will the particle become momentarily at rest?
17.
A woman driving a 2000 kg car along a level road at 30m/s takes her foot off the gas to see how far her car will roll before it slows to a stop. She discovers that it takes 150m.What is the average force of friction acting on the car?
18.
The radius of the wheel shown below is 0.75m. What is its moment of inertia?
19.
An ordinary refrigerator is turned on and its door is open in a thermally insulated kitchen. What is the temperature of the room?
20.
The length of an aluminium rod at a temperature of 20°c is 3m. What will be the ratio of change in the length of the rod to its original length if its temperature is raised to 120°c? the coefficient of linear expansion of aluminium is 3.31 x 10-5/K
21.
A very large open tank is full of oil whose density is 800kg/m. if the absolute pressure at the bottom of the tank is 1.81 x 105 Pa, then what is the depth of the oil? (Note that atmospheric pressure is 1.01 x 105Pa)
22.
A 1.5kg particle moves in the xy-plane with velocity what is its angular momentum when the position vector is
23.
A 2kg object experiences two concurrent forces of 100N at 30° above the positive x-axis and 80N at 60° above the negative x-axis. What is the magnitude of acceleration of the object?
24.
A driver moving at a constant speed of 20m/s sees an accident up ahead and hits the brakes. If the car decelerates at a constant rate of -5 m/s2 , how far does the car go before it comes to a stop?
25.
The energy spectrum emitted by a black body at different temperature is as shown in figure below. Which of the following statements is NOT correct about the black body energy spectrum?
26.
A rectangular loop carrying a current is situated near a long straight wire such that the wire is parallel to one of its sides of the loop and it is in a plane of the loop. If a steady current is established in the wire as shown in figure below, the loop will
27.
Which devices uses the principle of electromagnetic induction for its operation?
28.
An electron enters a region of uniform electric field of 5 x 103N/C. what is the force on the electron?
29.
In the circuit shown below, what is the potential difference between points B and D?
30.
The planet Jupiter is about 318 times as massive as earth, yet on its surface you would weigh only about 2.4 times your weight on earth. Why is this happened?
31.
A uniform ball of radius r and mass m starts from rest and rolls down a frictionless inline of height h. when the ball reaches the ground, how fast is it going?
32.
A ladder of length 3m and mass 20 kg leans against a smooth, vertical wall so that the angle between the wall and the ladder is 30°. What are the magnitudes of the normal forces at the contact point on the wall (Nw) and at the contact point on the ground?
33.
A container resting on the floor of an elevator contains an incompressible fluid of density ρ. When the elevator has an upward acceleration of magnitude �a� then what will be the pressure difference between two points in the fluid separated by a vertical distance Δh?
34.
If two particles have equal momenta, then which one of the following statements is TRUE about their kinetic energies?
35.
In Young�s double slit experiment both the separation between the slits and the distance between the slits and the screen are halved then, what is the fridge width?
36.
What is the capacitance of a capacitor that should be connected with 2 other capacitors having capacitance of 4F and 8F all in series to produce an effective capacitance of ?
37.
A particle of mass m is fired into a magnetic field of strength B at speed V. the particle travels in a circular path inside the field with a radius r. which of the following expressions gives the magnitude of the charge on the particle?
38.
An alternating current is represented by I(t) = 10.0 Asin (100?t). What are the amplitude and frequency of the alternating current?
39.
A series RLC circuit has a resistance of 45Ω and an impedance of 75Ω . What average power is delivered to this circuit when ΔVrms = 210V?
40.
A thin film of oil (n=1.25) is located on a smooth wet floor. When viewed perpendicular to the floor, the film reflects most strongly red light at 640nm and reflects no blue light at 512nm. How thick is the oil film?
41.
Which one of the following changes to parallel plate capacitor would not increase energy stored in the capacitor at a fixed voltage across the plates?
42.
Suppose that a voltage source produces 240V for a moment. By what percentage does the power output of 220V light bulb increases?
43.
A wire carries a steady current of 2.4A. A straight section of the wire is 0.75 m long and lies along the x-axis within a uniform magnetic field B = 1.6T along the +z axis. If the current is in the +x direction. What is the magnetic force on the section of the wire?
44.
If all the three resistors in the circuit shown in the figure have equal resistance , and the current flowing into resistor B is 4A, then what is the current flowing into resistor G?
45.
Refraction of a wave does NOT involve change in its
46.
Gas at a pressure P is contained in a vessel. If the masses of all the molecules are doubled and their speeds are half, then what will be the resulting pressure?
47.
Water flows through a fire hose of diameter 6.35cm at a rate of 0.012m3/s. the fire hose ends in a nozzle of inner diameter 2.20cm. What is the speed with which the water exits the nozzle?
48.
A bullet of mass 10gm, moving horizontally, strikes and embeds itself in a box of mass 1kg suspended from a light string as shown in the figure below. If the composite mass rises to a height, h=0.45m, then what is the speed of the bullet before collision?
