0
question_answer1) Assertion : The resistivity of a semiconductor increases with temperature. Reason : The atoms of a semiconductor vibrate with larger amplitude at higher temperatures thereby increasing its resistivity [AIIMS 2003]
question_answer2) Assertion : In a simple battery circuit the point of lowest potential is positive terminal of the battery Reason : The current flows towards the point of the higher potential as it flows in such a circuit from the negative to the positive terminal. [AIIMS 2002]
question_answer3) Assertion : The temperature coefficient of resistance is positive for metals and negative for p-type semiconductor. Reason : The effective charge carriers in metals are negatively charged whereas in p-type semiconductor they are positively charged. [AIIMS 1996]
question_answer4) Assertion : In the following circuit emf is 2V and internal resistance of the cell is 1 W and R = 1W, then reading of the voltmeter is 1V. Reason : \[V=E-ir\] where E = 2V, \[i=\frac{2}{2}=1A\] and R = 1 W [AIIMS 1995]
question_answer5) Assertion : There is no current in the metals in the absence of electric field. Reason : Motion of free electron are randomly. [AIIMS 1994]
question_answer6) Assertion : Electric appliances with metallic body have three connections, whereas an electric bulb has a two pin connection. Reason : Three pin connections reduce heating of connecting wires.
question_answer7) Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. Reason : On increasing temperature, conductivity of metallic wire decreases.
question_answer8) Assertion : The electric bulbs glows immediately when switch is on. Reason : The drift velocity of electrons in a metallic wire is very high.
question_answer9) Assertion : Bending a wire does not effect electrical resistance. Reason : Resistance of wire is proportional to resistivity of material.
question_answer10) Assertion : In meter bridge experiment, a high resistance is always connected in series with a galvanometer. Reason : As resistance increases current through the circuit increases.
question_answer11) Assertion : Voltameter measures current more accurately than ammeter. Reason : Relative error will be small if measured from voltameter.
question_answer12) Assertion : Electric field outside the conducting wire which carries a constant current is zero. Reason : Net charge on conducting wire is zero.
question_answer13) Assertion : The resistance of super-conductor is zero. Reason : The super-conductors are used for the transmission of electric power.
question_answer14) Assertion : A potentiometer of longer length is used for accurate measurement. Reason : The potential gradient for a potentiometer of longer length with a given source of e.m.f. becomes small.
question_answer15) Assertion : The e.m.f. of the driver cell in the potentiometer experiment should be greater than the e.m.f. of the cell to be determined. Reason : The fall of potential across the potentiometer wire should not be less than the e.m.f. of the cell to be determined.
question_answer16) Assertion : A person touching a high power line gets stuck with the line. Reason : The current carrying wires attract the man towards it.
question_answer17) Assertion : The connecting wires are made of copper. Reason : The electrical conductivity of copper is high.
Please Wait you are being redirected....
You need to login to perform this action.You will be redirected in 3 sec
OTP has been sent to your mobile number and is valid for one hour
Your mobile number is verified.