TEST SERIES 1: PHYSICS

Q.1 A stone falls freely from rest. The total distance covered by it in the last second of its motion equals the distance covered by it in the first three seconds. How long does the stone remain in air?
(a) 10 sec
(b) 5 sec
(c) 15 sec
(d) cannot be determined
Q2. A cricketer can throw a ball to a maximum horizontal distance of 100 m.With the same effort he throws the ball vertically upwards. What is the maximum height attained by the ball?
(a) 100 m
(b) 150 m
(c) 50 m
(d) 200 m
Q3 A body is projected with kinetic energy K at an angle of 60ْwith the horizontal. What is its potential energy at the highest point of its trajectory?
(a) 4K/3
(b) K
(c) 2k
(d) 3K/4
Q4. A man runs at a speed of 4kmph for the first half of the distance and runs at 5kmph for the remaining part of the journey. What is his average speed over the entire journey ?
(a) 4.5 kmph
(b) 40/9 kmph
(c) 20/9 kmph
(d) 5.4 kmph
Q5. A car moves at a speed of 36 kmph on a level road. The coefficient of friction between the tyres and the road is 0.8. The car negotiates a curve of radius R.What is the minimum value of R for which the car just starts skidding?
(a) 10 m
(b) 12.5 m
(c) 25 m
(d) 0.08 m
Q6. A stone tied to the end of a string 75.0 cm long is whirled in a horizontal circle with a constant speed. If the stone makes 20 revolutions in 25 seconds, find (i) the speed of the stone along the circle and (ii) acceleration of the stone.
(a) 3.77 m/s, 18.93 m/s^2
(b) 5.028 m/s, 33.7077 m/s^2
(c) 3.77 m/s, 0 m/s^2
(d) 14 m/s, 0 m/s^2
Q7. The distance x moved by a body of mass 0.5 Kg by a force varies with time as x = 3*t^2 + 4t +5 where x is expressed in metre and t in second. What is the work done by the force in the first 2 seconds? t^2 = t*t, i.e., t squared
(a) 60 J
(b) 75 J
(c) 64 J
(d) 3 J
Q8. A wire of cross-sectional area A at temperature T is held taut with negligible tension between two rigid supports. If the wire is cooled to a temperature (T – t), what is the tension developed in the wire? The coefficient of linear expansion is 'a' and the Young’s modulus of the wire is Y.
(a) YAat
(b) Yt
(c) AY
(d) Cant be determined
Q9 A copper block of mass 2 Kg is heated to a temperature of 500ْC and then placed in a large block of ice at 0ْC. What is the maximum amount of ice that can melt? The specific heat of copper is 400 J/kg/c and the latent heat of fusion of ice is 3.5 × 10^5 J/kg
(a) 7/8 kg
(b) 8/7 kg
(c) 8 kg
(d) 7 kg
Q10 When 20 J of work is done on a gas, 40 J of heat energy is released. If the initial internal energy of the gas was 70 J, what is the final internal energy?
(a) 50 J
(b) 100 J
(c) 25 J
(d) 200 J
Q11. Cooking vegetables and other food in a pressure cooker saves time and fuel because
(a) under increased pressure, water can be made to boil at a temperature much lower than 100 C
(b) heat losses are reduced to a minimum
(c) condensation of steam is prevented
(d) under increased pressure, water can be made to boil at a temperature much higher than 100ْC
Q12. Which of the following statements is true about a gas undergoing an adiabatic change?
(a) the pressure of the gas remains constant
(b) the volume of the gas remains constant
(c) the gas is completely insulated from the surroundings.
(d) the temperature of the gas remains constant
Q13 Two positive point charges, 12 microColoumb and 8 microCouloumb respectively, are placed 10 cm apart in air. What is the work done in bringing them 4 cm closer? Use 1/4*pi*e = 9*10^9
(a) 3.4 J
(b) 154 J
(c) 384 J
(d) 5.8 J
Q14. Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them will the electric field be zero?
(a) At the mid-point
(b) At no point
(c) 20 cm from +q
(d) 20cm from +4q
Q15. The refractive index of a medium is 1.732 . Calculate the angle of refraction if the unpolarized light is incident on it at the polarizing angle of the medium (in degrees)
(a) 30 degrees
(b) 60 degrees
(c) 90 degrees
(d) It reflects
Q16. A cell supplies a current of 0.9 A through a 2 Ohm resistor and 0.3 A through a 7 Ohm resistor. What is the internal resistance of the cell
(a) 2 ohm
(b) 14/9 ohm
(c) 0.5 ohm
(d) 9 ohm
Q17. A capacitor is charged using a battery. Then the battery is disconnected. Now a dielectric slab is introduced between the plates which results in the
(a) decrease in the potential difference between the plates and reduction in the stored energy but no change in the charge on the plates
(b) reduction of charge on the plates and increase of potential difference between the plates
(c) increase in the potential difference between the plates and reduction in the stored energy, but no change in the charge of the plates
(d) None of these
Q18. When a capacitor is connected to a battery
(a) no current flows in the circuit at all
(b) a current flows in the circuit for some time and then decreases to zero
(c) the current keeps on increasing, reaching a maximum value when the capacitor is charged to the voltage of the battery
(d) an alternating current flows in the circuit
Q19. An electric dipole placed with its axis inclined at an angle to the direction of a uniform electric field experiences
(a) neither a force nor a torque
(b) a force as well as a torque
(c) a force but no torque
(d) a torque but no force
Q20. Which of the following is true in the case of inelastic collisions with respect to Total Energy, Kinetic Energy and Momentum respectively
(a) Not Conserved, Not Conserved, Conserved
(b) Conserved, Conserved, Not Conserved
(c) Conserved, Conserved, Conserved
(d) Conserved, Not Conserved, Conserved

Analysis and discussions will be with members only.

Useful Article : Relation and Function 1

Relations
A Relation is a rule that gives one or more outputs for every valid input. The input is the Independent Variable, and x is often used as the input variable. The output is the dependent variable, and y is often used as the output variable. The output depends on the input value.

The relation may be described as:

1. Set of ordered pairs: The {} represents the set, and (,) represents the ordered pair. The ordered pair means (1, 2) and (2, 1) are different. The first element in the ordered pair is the input, and the second element is the output.Example: { (-2, 1), (0, 3), (2, 1), (-1, 5) }
2. An equation: An equation that relates the input and output. Examples: y=x2+2x=-1 x2+y2=25
3. A Rule/ description in words: A rule that relates the input and the output. Examples: The output is three times the input; the width of the rectangle is 5 units more than the length.
4. An arrow diagram:
5. A continuous graph:
6. A scatter plot: It is also known as a discrete graph.
7. An input/output diagram
8. A table:

Week No. 2: AIEEE Special

Q1. The only force acting on a 2.0 kg body as it moves along the positive x axis has an component of force -6x N, where x is in meters. The velocity of the body at x=3.0 m is 8.0 m/s. (a) What is the velocity of body at x=4.0 m ? (b) At what positive value of x will the body have a velocity of 5.0m/s ?

Q2. A 0.30 kg mass sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (with k=500 N/m) whose other end is fixed. The mass has a kinetic energy of 10J as it passes through its equilibrium position. (a) At what rate is the spring doing work on the mass as the mass passes through its equilibrium position. (b) At what rate is the spring doing work on the mass when the spring is compressed 0.10 m and the mass is moving away from the equilibrium position ?

Week No.1 : AIEEE Special

Q1. Two electrons are fixed 2.0 cm apart. Another electron is shot from infinity and comes to rest midway between the two. What was its initial speed ?
Q2. A particle of positive charge Q is fixed at point P. A second particle of mass m and negative charge -q moves at a constant speed in a circle of radius r1, centered at P.. What is the work done by an external agency to increase the radius to r2?

TARGET AIEEE 2010

In this section we will give tips for success in Physics & Mathematics for above examination. Just visit regularly..

TARGET CBSE 2010

In this section we will give tips for scoring >90% in Physics & Mathematics. For more tune into this website.

For sample class it is only Rs. 150/- class subject to maximum 3 classes.

Terms and Conditions

1. For sample class fee is payble either advance / at the end of class.

2. First 2 month fee is payble in advance.

Welcome

Welcome to Dr. SB's Topper Point.

Here it is our constant endeavour to improve the teaching methodology enabling students better confidence and success.

We have listed below our idea of accepting students.

Mode of Teaching : Home Tution

Class undertaken : X , XII CBSE MATH / PHYSICS
( Students aspiring for AIEEE will get maximum benefit)

Fee Details : Monthly fees Rs. 3000/-