Home/Class 11/Physics/

Question and Answer

Two bodies moving towards each other collide and move away in opposite directions. There is some rise in temperature of bodies because a part of the kinetic energy is converted into
(A) Heat energy
(B) Electrical energy
(C) Nuclear energy
(D) Mechanical energy


Answer: A
To Keep Reading This Answer, Download the App
star pngstar pngstar pngstar pngstar png
Review from Google Play
To Keep Reading This Answer, Download the App
star pngstar pngstar pngstar pngstar png
Review from Google Play
Watch More Related Solutions
Escape velocity of a body from the surface of earth is \(11\ldotp 2\;km/sec\). If the mass of earth becomes double of its present mass and radius becomes half of its present radius then escape velocity will become ( )
A. 5.6 km/s
B. 11.2 km/s (remains unchanged)
C. 22.4 km/s
D. 44.8 km/s
In stationary waves, distance between a node and its nearest antinode is \(20\;cm\) . The phase difference between two particles having a separation of \(60\;cm\) will be     ( ) 
A. zero
B. \(\pi /2\)
C. \(\pi\)
D. \({3}\pi/{2}\)
A current of \(2\;A\)flows in a long, straight wire of radius \(2\;mm\). The intensity of magnetic field on the axis of the wire is ( )
A. \({\left(\frac{{\mu_{{{0}}}}}{{\pi}}\right)}\times{10}^{{{3}}}\) Tesla
B. \({\left(\frac{{\mu_{{{0}}}}}{{{2}\pi}}\right)}\times{10}^{{{3}}}\) Tesla 
C. \({\left(\frac{{{2}\mu_{{{0}}}}}{{\pi}}\right)}\times{10}^{{{3}}}\) Tesla
D. Zero
Two bodies (M) and (N) of equal masses are suspended from two separate massless springs of spring constants (k_1) and (k_2) respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, the ratio of the amplitude of vibration of (M) to the of (N) is.
(A) \(\frac{{k}_{{{1}}}}{{k}_{{{2}}}}\)
(B) \(\sqrt{{\frac{{k}_{{{1}}}}{{k}_{{{2}}}}}}\)
(C) \(\frac{{k}_{{{2}}}}{{k}_{{{1}}}}\)
(D) \(\sqrt{{\frac{{k}_{{{2}}}}{{k}_{{{1}}}}}}\)
The coefficient of self-inductance of a solenoid is \({0.18}{m}{H}\). If a crude of soft iron of relative permeability \({900}\) is inserted, then the coeffcient of self-inductance will become nearly
(A) \({5.4}{m}{H}\)
(B) \({162}{m}{H}\)
(C) \({0.006}{m}{H}\)
(D) \({0.0002}{m}{H}\)
The relation between number of free electrons \({\left({n}\right)}\) in a semiconductor and temperature \({\left({T}\right)}\) is given by
(A) \({n}\propto{T}^{{{2}}}\)
(B) \({n}\propto{T}\)
(C) \({n}\propto\sqrt{{{T}}}\)
(D) \({n}\propto{T}^{{{3}/{2}}}\)
Assertion : In transistor common emitter mode as an amplifier is preferred over common base mode.
Reason : In common emitter mode the input signal is connected in series with the voltage applied to the base emitter function.
(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(C) If assertion is true but reason is false.
(D) If the assertion and reason both are false.
The dispersive powers of glasses of lenses used in an achromatic pair are in the ratio 5 : 3. If the focal length of the concave lens is 15 cm , then the nature and focal length of the other lens would be  ( )
A. convex, 9 cm 
B. concave, 9 cm
C. convex, 25 cm
D. Concave, 25 cm
When white light enters a prism, it gets split into its constituent colours.  This is due to ( )
A. High density of prism material 
B. Diffraction of light
C. Because \(\mu\) is different for different \(\lambda\) 
D. Velocity changes for different frequencies 
Stilt roots are reported from
(A) Pandanus (Screw pine)
(B) Radish
(C) Mango-ginger
(D) Bryophyllum

Load More