Two lines A and B in the figure shows the variation of de-Broglie wavelength \[\lambda \] versus \[1/\sqrt{V},\] where V is the accelerating potential difference, for two particles carrying the same charge. Which one of the two represents a particle of smaller mass? |
While conducting an experiment, using meter bridge, to determine a value of an unknown resistance, Rahul obtained deflection in the galvanometer in the same direction even after repeated adjustment in the circuit and getting faulty answer. Under the observation and guidence of his laboratory instructor, he finally succeeded in his experiment. |
(i) Write any one possible reason for getting the deflection in the galvanometer in the same direction. |
(ii) What values displayed by lab instructor? |
In the below figure, a bar magnet is quickly moved towards a conducting loop having a capacitor. Predict the polarity of the plates A and B of the capacitor. |
One day Chetan's mother developed a severe stomach ache all of a sudden. She was rushed to the doctor who suggested for an immediate endoscopy test and gave an estimate of expenditure for the same. Chetan immediately contacted his class teacher and shared the information with her The class teacher arranged for the money and rushed to the hospital. On realizing that Chetan belonged to a below average income group family, even the doctor offered concession for the test fee. The test was conducted successfully. |
Answer the following questions based on the above information. |
(i) Which principle in optics is made use of in endoscopy? |
(ii) Briefly explain the values reflected in the action taken by the teacher. |
The wire shown in the figure given below, carries a current of 10 A. Determine the magnitude of the magnetic field at the centre O. Given, radius of the bent coil is 3 cm. |
Sumit was worried that he would be late for school as his mom woke up late in the morning after attending marriage ceremony of her relative. But she told Sumit not to get worried and cooked lunch for Sumit within fifteen minutes with the help of microwave and Sumit could take the lunch. |
Read the above passage and answer the following questions: |
(i) Microwave ovens are used now a days to cook food quickly how? Give reason. |
(ii) What value is reflected by Sumit's mother? |
The electric potential, V as a function of distance (x) is shown in the figure. Construct a graph of the electric field strength, E versus distance x. |
Graph electric potential versus distance |
OR |
The graph shows the variation of charge q versus potential difference V for two capacitors, \[{{C}_{1}}\] and \[{{C}_{2}}.\] The two capacitors have the same plate separation but the plate area of \[{{C}_{2}}\] is double than that of \[{{C}_{1}}.\] |
Which of the lines in the graph correspond to \[{{C}_{1}}\] and \[{{C}_{2}}\] and why? |
Variation of charge versus potential |
Devansh was keenly watching the T-20 match of cricket with his uncle. The moment Virat Kohli made a sixer, suddenly the picture started shaking on TV screen. As he was disturbed, he came out in the balcony and saw a low flying aircraft passing over their house with a sound. Immediately his uncle explained the cause of shaking picture. |
Read the above passage and answer the following questions : |
(i) What kind of communication mode is used in TV transmission? How does a low flying aircraft disturb a picture in a TV? |
(ii) What is the relation between coverage distance and height of transmitting antenna? |
(iii) What values are reflected in the approach of Devansh's uncle? |
Determine the current in each branch of the network shown in figure. |
A horizontal straight wire 10 m long extending from East to West is falling with a speed of 5 m/s at right angles to the horizontal component of the Earth's magnetic field \[0.30\times {{10}^{-4}}Wb{{m}^{-2}}.\] |
(i) What is the instantaneous value of the emf induced in the wire? |
(ii) What is the direction of the emf? |
(iii) Which end of the wire is at the higher electrical potential? |
During Physics practical period, Mr. John Rohit's Physics teacher gave the students three different lenses of power 0.5 D, 4D and 10D; and asked them to identify which of these three lenses are suitable for constructing a good astronomical telescope. As the topic of optical devices were already taught in the previous class, so Rohit among all students could identify the lenses. |
Read the above passage and answer the following questions: |
(i) Which lenses are used as objective and which one as eyepiece? |
(ii) Among two convex lenses of same focal length but of aperture \[{{A}_{1}}\] and \[{{A}_{2}}\] \[({{A}_{2}}<{{A}_{1}}),\] used as objective lens in astronomical telescope, which will be preferred and why? (Provided they have identical eyepiece) |
(iii) What values are shown by Rohit? |
Sketch the graph, showing the variation of stopping potential with frequency of incident radiation for two photosensitive metals A and B having threshold frequencies \[{{v}_{0}}'\]and \[{{v}_{0}},\] respectively \[(v{{'}_{0}}>{{v}_{0}}).\] |
(i) Which of the two metals, A or B has higher work function? |
(ii) What information do you get from the slope of the graphs? |
(iii) What does the value of the intercept of graph on the potential axis represent? |
(i) Give the V-I characteristics of p-n junction diode. |
(ii) The Zener diode is fabricated by heavily doping of both p and n-sides of junction. Give reason. |
(iii) A 200 V AC supply is connected between points A and B as shown in the figure. What will be the potential difference V across the capacitor? |
(i) Name the logic gate. |
(ii) Write its truth table. |
(iii) Give the output waveform. |
In the following circuits shown, if the input waveform is as shown in figure what will be the output waveform |
(i) across R in Fig. (a) |
(ii) across the diode in Fig. (b) |
Assume that the diode is ideal. |
(i) The coil area of a galvanometer is \[25\times {{10}^{-4}}{{m}^{2}}.\] It consists of 150 turns of a wire and is in a magnetic field of 0.15 T. The restoring torque constant of the suspension fibre is \[{{10}^{-6}}N-m\] per degree. |
Assuming the magnetic field to be radial, calculate the maximum current that can be measured by the galvanometer, if the scale can accommodate. \[30{}^\circ \] deflection. |
(ii) Show that the electron revolving around the nucleus in a radius r with orbital speed v has magnetic moment evr/2. Write an expression of magnetic moment of the electron in terms of its angular momentum. |
Or |
(i) A bar magnet of magnetic moment \[1.5\text{ }J{{T}^{-1}}\] is aligned with the direction of a uniform magnetic field of 0.22 T. |
(a) What is the amount of work required to turn the magnet, so as to align its magnetic moment |
(A) normal to the field direction? |
(B) opposite to the field direction? |
(b) What is the torque on the magnet in cases (A) and (B). |
(ii) How does the angle of dip vary as one moves from the equator towards the North pole? If the horizontal component of Earth's magnetic field at a place when the angle of dip is \[60{}^\circ \] is \[0.4\times {{10}^{-\,4}}T.\] Calculate the vertical component and the resultant magnetic field of the Earth at that point. |
What is diffraction of light? Draw and discuss the graph showing the variation of intensity with angle in a single slit diffraction experiment. |
How would the diffraction pattern of a single slit be affected when |
(i) the width of the slit is decreased? |
(ii) the monochromatic source of light is replaced by a source of white light? |
Or |
(i) Derive the formula for refraction at concave refracting surface when the object lies in the rarer medium. Write the sign convention used. |
(ii) What happens to the focal length of the lens when it is immersed in water. |
Figure shown below, shows how the reactance of a capacitor varies with frequency. |
\[Frequency\,\,(Hz)\to \] Graph capacitive reactance versus frequency |
(i) Use the information of the graph to calculate the value of capacitance of capacitor. |
(ii) An inductor of inductance L has the same reactance as the capacitor at 100 Hz. Find the value of L. |
(iii) Using the same axes, draw a graph of reactance against the frequency for the inductor given in part (ii). |
(iv) If this capacitor and inductor were connected in series to a resistor of \[10\,\Omega ,\] what would be the impedance of the combination at 300 Hz? |
(v) A charged \[30\,\mu F\]capacitor is connected to a 27 mH inductor. What is the angular frequency of free oscillations of the circuit? |
Or |
Draw a labelled diagram of AC generator, explain its theory and working. An armature coil consists of 20 turns of wire, each of area \[A=0.09\text{ }{{m}^{2}}\] and total |
resistance \[15\,\Omega .\] It rotates in a magnetic field of 0.5T at a constant frequency \[150/\pi \,Hz.\] Calculate the value of maximum emf produced in the coil. |
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