1) Increase in velocity of sound in the air for 1°C rise in temperature is_________________? a. 1.61 ms-1 b. 61.0 ms-1 c. 0.61 ms-1 d. 2.00 ms-1
|
||||
2) On loading the prong of a tuning form with wax its frequency____________________? a. increases b. decreases c. remains unchanged d. may increase or decrease
|
||||
3) The normal ear is the most sensitive in the frequency range___________________? a. 20000 to 30000 hertz b. 10 to 20 hertz c. 2000 to 4000 hertz d. 6000 to 8000 hertz
|
||||
4) The velocity of sound in air would become double than its velocity at 0°C at temperature________________? a. 313°C b. 586°C c. 819°C d. 1172°C
|
||||
5) The periodic alternation of sound between maximum and minimum loudness are called___________________? a. silence zone b. interference c. beats d. resonance
|
||||
6) Beats are the results of____________________? a. diffraction of sound waves b. constructive and destructive interference c. polarization d. destructive interference
|
||||
7) Doppler effect applies to____________________? a. sound wave only b. light wave only c. both sound and light waves d. neither sound nor light wave
|
||||
8) A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency ? a. 1/4f b. 1/2f c. frequency lower than 20 Hz d. 2f
|
||||
9) In open organ pipe___________________? a. only even harmonics are present b. only odd harmonics are present c. both even and odd harmonics are present d. selected harmonics are present
|
||||
10) The dimension of elastic modulus is ___________________ ? a. ML-1T-2 b. ML-2T-2 c. MLT-2 d. ML2T-2
|
||||
11) Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are__________________? a. Longitudinal b. Transverse c. Periodic d. both A and C
|
||||
12) Laplace found that the alternate compressions and rarefactions produced in sound waves follows ________________? a. isothermal law b. adiabatic law c. isochoric law d. all of the above
|
||||
13) The beats frequency (sensible) for a human car is _____________________? a. 42Hz b. 7 Hz c. 256Hz d. 262Hz
|
||||
14) Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe? a. One b. Two c. Four time d. None of these
|
||||
15) The current through a metallic conductor is due to the motion of _________________? a. free electrons b. protons c. neutrons d. still under controversy
|
||||
16) A wire having very high value of conductance is said to be____________________? a. very good conductor b. moderately good conductor c. an insulator d. no specific criterion available
|
||||
17) Production of heat due to an electric current flowing through a conductor is given by _________________? a. Joule effect b. Joule Thomsons effect c. Comptons effect d. Feed back effect
|
||||
18) Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ? a. 40 W b. 90W c. 100W d. 120W
|
||||
19) Thermocouples convert___________________? a. heat energy into electrical energy b. heat energy into light energy c. heat energy into mechanical energy d. mechanical energy into heat energy
|
||||
20) An immersion heater of 400 watts kept on for 5 hours will consume electrical power of __________________? a. 2KWh b. 20KWh c. 6KWh d. 12KWh
|
||||
21) Resistance of an ideal insulator is __________________? a. infinite b. zero c. finite d. depends upon nature
|
||||
22) Reciprocal of resistivity is called__________________? a. resistance b. inductance c. conductivity d. flexibility
|
||||
23) Circuit which gives continuously varying potential is called _______________________? a. complex network b. wheat stone bridge c. potential divider d. all of above
|
||||
24) There are three bulbs of 60W 100W and 200W which bulb has thickest filament ? a. 100W b. 200W c. 60W d. all
|
||||
25) Specific resistance of a wire____________________? a. will depend on its length b. will depend on its radius c. will depend on the type of material of the wire d. will depend on none of the above
|
||||
26) In the following figure, the terminal potential is ___________________ ? a. zero b. 2V c. 12V d. 36V
|
||||
27) Which one of the following materials is useful for making bulb filaments ? a. constantan b. nichrome c. copper d. tungsten
|
||||
28) If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be_______________? a. 3600C b. 7200C c. 1C d. 2C
|
||||
29) Why should a resistance be introduced in a circuit in series deliberately ? a. to increase current b. to decrease current c. to control current d. just to give a good look to circuit
|
||||
30) All electrical appliances are connected in parallel to each other between the main line and neutral wire to get ______________________? a. same current b. same current and potential difference c. different current but same potential difference d. different current and potential differences
|
||||
31) Resistance of a conductor depends upon_________________? a. nature of conductor b. dimension of conductor c. physical state of the conductor d. all of above
|
||||
32) A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part _________________? a. remains the same b. is doubled c. is halved d. becomes zero
|
||||
33) When same current passes for same time through a thick and thin wire_________________? a. more heat is produced in thick wire b. more heat is produced in thin wire c. no heat is produced in wire d. less heat is produced in thick wire
|
||||
34) One kilowatt hour is the amount of energy delivered during _______________? a. one second b. one day c. one minute d. one hour
|
||||
35) How much heat does a 40 W bulb generates in one hour ? a. 144000J b. 144J c. 1.44J d. 14J
|
||||
36) Resistance of a super conductor is ______________________? a. finite b. infinite c. zero d. changes with every conductor
|
||||
37) Which one is the best material for making connecting wires ? a. iron b. tungsten c. silver d. copper
|
||||
38) Internal resistance is the resistance offered by________________? a. source of EMF b. conductor c. resistor d. capacitor
|
||||
39) Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains ? a. 40 W bulb b. 60 W blub c. 100 W blub d. all will burn equally brightly
|
||||
40) Resistance of a wire on increasing its temperature will_________________? a. increase with rise in temperature b. decrease with rise in temperature c. will remain same d. depends upon altitude of experimentation
|