Welcome to your physics 2010
2.
race car is moving at a constant speed of 35m/s . A security car was moving at a speed of 5m/s as the race car passes by it and was accelerating at constant rate of 5 m/s2. What was the speed of the security car when it took over the race car ?
3.
A car start moving from rest and its motion on a straight line is shown in the figure below. What is the average velocity of the car within the first 6 seconds?
4.
Which one of the following statements is correct regarding the motion in a plane?
5.
A bullet is fired at an angel of 30° above the horizontal. If air resistance is neglected, what should be the bullet�s horizontal acceleration and vertical acceleration when it reaches its maximum height?
6.
Two students A and B, with masses mA and mB respectively, stand on a wheeled trolleys as shown in the figure below. If student A has larger mass and pushes student B, then what can be said about their accelerations?
7.
Which of the following statement is correct about errors in measurement?
8.
What can be conclude when the number of significant figures increases?
10.
The diagram below shows a path taken by a flying bird. Which one of the following vector may represent a resultant displacement
11.
A body that is released from the top of a tall building reaches the ground after six seconds. What is the ratio of the kinetic energy acquired by it at the end of the first three seconds to the increment in the kinetic energy during the next three seconds?
12.
A boy pushes a block over 12m distance within 6 seconds. The force applied by the boy varies as shown in the diagram below. What is the average power loss by the boy?
13.
A thin rod when rotated about an axis at the end of the rod has a moment of inertia 1/3ML2. The rod has a mass of 1.5kg and length of 1.0 m. if the rod initially at rest gains a rotational kinetic energy of 1000.0 J, at what speed does it rotate?
14.
A ring a solid cylinder and a solid sphere, all having the same mass and the same radius, are held at the top of an inclined plane as shown in the figure below. If the objects roll with out sliping and the coefficient of static friction between each object and the plane is 0.3, which one of the following shows the order in which they will get to the bottom of the inclined plane?
15.
If in a given rotational system of a body the angular momentum is increased with time, which one of the following statement is not correct?
16.
Which of the following is a correct statement about the first condition of equilibrium?
17.
For a constant force F, if the impulse imparted to the system is large, then what can you conclude about the collision?
18.
An open trolley is rolling on a level surface without frictional loss through a vertical downpour of rain, as shown in the figure below. As the trolley rolls, an appreciable amount of rainwater accumulates in the cart. What will be the speed of the cart?
19.
A satellite moves at a constant speed in a circular orbit about the center of the earth at an altitude half the radius of the earth above its surface. If g is the gravitational acceleration at the surface of the earth and R its radius, then what is the speed of the satellite?
20.
An object of mass 1kg moving with a speed of 2m/s was acted on by a force that produces an acceleration of 2m/s2. What is the change in kinetic energy of the object if the force is exerted on the object for 2seconds in its direction of motion?
21.
In the figure below, what is the speed of water as it leaves A2?
22.
An electric immersion water heater is rated at 400w. how long will it take to heat one kilogram of water from 10 to 30 ? (the specific heat of water is 4.2 J/g k.)
23.
If the internal energy of the system decreases, then what can be concluded about the heat and the work done?
24.
If a thermodynamic system undergoes a process in which its internal energy increased by 400 J while doing 200 J of work on its surrounding, then what is the energy absorbed in or extracted from it in the form of heat?
25.
Which of the following statement is not correct?
26.
A heat engine operating between 100°C and 700°C has efficiency equal to 40 % of the maximum theoretical efficiency. How much energy does this engine extract from the hot reservoir in order to do 5000 J of mechanical work?
27.
From the figures given below, which one is in equilibrium?
28.
Which of the following figure indicates tensile deformation?
29.
A beaker with water resting on a scale weighs 40 N. a block suspended on a hanging spring weighs 20 N. the spring scale reads 15 N when a block is fully submerged in the water. What is the reading of a scale on which the beaker with water rests, while the block is submerged in the water after detached from the hanging spring?
30.
An object with a mass of 150 kg and a volume of 0.75 m3 is floating in a liquid of density 0.8 g/cm3. What percentage of the objects volume will be submerged below the surface of the fluid?
31.
Why is an interference pattern not observed between the lights produced from a pair of car headlights?
32.
Suppose that three point charges are placed along a straight line and electrostatic force exerted on the middle charge is zero. What can we conclude about the charges?
33.
Two parallel plates are kept at 3 V and 5 V as shown in the diagram below. If an electron is released at O, then which way will the electron move?
34.
A capacitor of 12 μF capacitance can fully charged after it is connected between a potential difference of 9 V. how much external energy is used in charging the capacitor?
35.
A copper wire of cross sectional area 2 mm2 carrying a current of 1.5 A. if the drift velocity of the electron is 0.00028 m/s, what is the number of charge carriers (free electrons) per unit volume in the copper wire?
36.
Which of the following statement is correct?
37.
What makes the oscillatory motion a simple harmonic motion?
38.
The two end fixed string of length 0.5m has a mass per unit length 2 g/m. if the tension in the string is 80 N, what is the second harmonic frequency?
39.
Which one of the following is not the use of Doppler effect?
40.
A 632.8 nm laser light produces an interference pattern on a screen of 4.0 m from a pair of slits. The slit space is equal to 0.2 mm. calculate the fridge width.
41.
A magnetic field of strength 5 x 10-5 T passes through an area of 20 cm3 that is an angel of 60° to the magnetic field. What is the magnetic flux?
42.
An inductor has a self inductance of 12 mH. The current in the circuit decreases at a rate of 2.0 A/s. what is the magnitude of the induced electromotive force?
43.
Which of the following is correct about the characteristics of current and voltage in A.C circuits?
44.
An RLC circuit is designed to have a resistance of 400 ?, capacitive reactance of 350 ? and inductive reactance of 50 ?. The circuit is connected to an alternative voltage source of effective (rms) valve 50 v and frequency of 50 Hz. What is the average output power?
45.
Which of the following has an electron volt unit?
46.
In Rutherford experiment, a beam of positively charged alpha particles was projected in to a thin piece of a gold foil. One of the observation of this experiment is that some charged particles deflected through a large angel (10° to 90° ) are those concentrated in one place. What conclusion can be drawn from this observation?
47.
In the circuit shown below, each resistor has a value of 3 ?. What is the value of the current through R4?
48.
Suppose you obtain a piece of iron from your laboratory shelf. How can you experimentally determine, for sure, that is magnetized?
49.
If a charged particle enters in to a uniform magnetic field perpendicular to its direction, then what will happen?
50.
Two parallel wires each carrying 5 A current in the same direction are separated by 2.5cm. what is the magnitude of the force per unit length acting on the wires? Is the force attractive or repulsive?
