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The distance between two point charges is 20 cm if the distance is reduced to 10 cm the coulomb’s force would become : Half , Two times , one-fourth , four times
The wavelength of a wave passing though a medium is 0.1 meter.if wave speed is 2 mS-1,then calculate the wave frequency 20Hz , 15Hz , 2Hz , 0.2Hz
Linear magnification is equal to : qp , q/p , p/q , p+q
The center region of the transistor is known as : Base , Emitter , Collector , Junction
Speed of sound is solid is -------------then in air : Less , Greater , Equal , None of these
technology is applied in a mobile phone : Telephone , Television , Radio , Fax
penetrating power of --------rays is very high : Alpha , Beta , Gama , x-ray
Electric charges are of ------kinds : 2 , 3 , 1 , 4
Transformer are of ---------type : 3 , 4 , 2 , 5
The substance in which electric current flow easily are called : Conductor , Insulator , semi Conductor , transistor
The unit of electric Power is called : Joule , Watt , Newton , Ohm
According to Hooke’s law : F = KX , F = K/X , F = X/K , F = KX^2
The part of a stationary waves where the amplitude become zero, said : Nodes , Antinodes , Compressions , Crests
Optical fibres work on the principal of : Refraction , Diffraction , Dispersion , Total internal reflection
The device which measures the potential difference is called : Ammeter , Galvanometer , Voltmeter , All of these
speed of light is: 3 x 10^8 mS-1 , 3 x 10^12 mS-1 , 3 x 10^10 mS-1 , 3 x 10^9 mS-1
what is fitted in a telephone receiver ? Electromagnet , Diaphragm , Electromagnet Diaphragm , None of these
The device which changes alternating voltage, said : Amplifier , Rectifier , Diode , Transformer
The wavelength of wave passing through a medium is 0.1m, if wave speed is 2 mS-1 then the wave frequency is : 5 Hz , 10 Hz , 20 Hz , 40 Hz
Distance between node and next antinode is : ?/4 , 2 ? , 4 ? , ?/2
The straight line which connects pole and centre of curvature is called : Centre of curvature , Principal axis , Pole , Principal focus
Formula of electric field intensity is : F = Eq , E= Fq , q=E/F , E = F/Q
Instrument used for detecting and testing the nature of charge on body is : Incubator , Spectroscope , Voltmeter , Electroscope
The two input of NAND gate and A and B .Its output would be ‘0’ when : A =0.B = 1 , A =1.B = 1 , A =1.B = 0 , A =0.B = 0