Physics-
General
Easy
Question
AB is potentiometer wire of resistance per unit length 0.09 W/cm and e is an unknown emf of a battery to be measured. e cannot be measured using the potentiometer shown if the value of e is (select the most appropriate answer)
- greater than 8.0 V
- greater than 8.5 V
- greater than 9.0 V
- greater than 9.5 V
The correct answer is: greater than 9.0 V
Potential on AB wire is 9V
Hence e greater then 9v cannot be measured
Related Questions to study
Physics-
The time when the voltage across the resistor drops to nearly 37% of the value just after the switch Sw is closed : (R = 100 kW, C = 1mF) is
The time when the voltage across the resistor drops to nearly 37% of the value just after the switch Sw is closed : (R = 100 kW, C = 1mF) is
Physics-General
Physics-
Three batteries are connected as shown in figure. Reading of ideal ammeters A1 ,A2 & A3 are :
Three batteries are connected as shown in figure. Reading of ideal ammeters A1 ,A2 & A3 are :
Physics-General
Physics-
Four resistances are connected by an ideal battery of emf 50 volt, circuit is in steady state then the current in wire AB is :
Four resistances are connected by an ideal battery of emf 50 volt, circuit is in steady state then the current in wire AB is :
Physics-General
Physics-
If an ideal cell of emf 5 volt shown in the figure gives a power of 10 W , find the powers consumed by the resistors 2 W and 1 W.
If an ideal cell of emf 5 volt shown in the figure gives a power of 10 W , find the powers consumed by the resistors 2 W and 1 W.
Physics-General
Physics-
Five bulbs B1 , B2 , B3 and B4 each of rating 60W / 200V and B5 of rating 120W /400V are connected as shown in circuit. Total power consumption by all the bulbs is :
Five bulbs B1 , B2 , B3 and B4 each of rating 60W / 200V and B5 of rating 120W /400V are connected as shown in circuit. Total power consumption by all the bulbs is :
Physics-General
Physics-
In the shown circuit, all three capacitor are identical and have capacitance C mF each. Each resistor has resistance of R W. An ideal cell of emf V volts is connected as shown. Then the magnitude of potential difference across capacitor C3 in steady state is
In the shown circuit, all three capacitor are identical and have capacitance C mF each. Each resistor has resistance of R W. An ideal cell of emf V volts is connected as shown. Then the magnitude of potential difference across capacitor C3 in steady state is
Physics-General
Physics-
Conductor of length l has shape of a semi cylinder of radius R (<< l). Cross section of the conductor is shown in the figure. Thickness of the conductor is t (<< R) and conductivity of its material varies with angle q according to the law s = s0 cosq where s0 is a constant. If a battery of emf e is connected across its end faces (across the semi–circular cross-sections), the magnetic induction at the mid point O of the axis of the semi-cylinder is :
Conductor of length l has shape of a semi cylinder of radius R (<< l). Cross section of the conductor is shown in the figure. Thickness of the conductor is t (<< R) and conductivity of its material varies with angle q according to the law s = s0 cosq where s0 is a constant. If a battery of emf e is connected across its end faces (across the semi–circular cross-sections), the magnetic induction at the mid point O of the axis of the semi-cylinder is :
Physics-General
Physics-
Block A of mass m is placed on a plank B. A light support S is fixed on plank B and is attached with the block A with a spring of spring constant K. Consider that initially spring is in its natural length. If the plank B is given an acceleration a, then maximum compression in the spring is k xma . Find the value of x. (All the surfaces are smooth)
Block A of mass m is placed on a plank B. A light support S is fixed on plank B and is attached with the block A with a spring of spring constant K. Consider that initially spring is in its natural length. If the plank B is given an acceleration a, then maximum compression in the spring is k xma . Find the value of x. (All the surfaces are smooth)
Physics-General
Physics-
A block B of mass 10 kg is placed on smooth horizontal surface over it another block A of same mass is placed. A horizontal force F is applied on block B
S1 : No block will move unless F > 10 N.
S2 : Block A will move towards left.
S3 : Acceleration of block B will never be less than that of A.
S4 : The relative motion between A and B will start when F exceeds 10 N.
A block B of mass 10 kg is placed on smooth horizontal surface over it another block A of same mass is placed. A horizontal force F is applied on block B
S1 : No block will move unless F > 10 N.
S2 : Block A will move towards left.
S3 : Acceleration of block B will never be less than that of A.
S4 : The relative motion between A and B will start when F exceeds 10 N.
Physics-General
Physics-
O is a point at the bottom of a rough plane inclined at an angle a to the horizontal. Coefficient of friction between AB is 
and between BO is
. B is the mid–point of AO. A block is released from rest at A. Then identify which graphs are correct during motion of block from point A to O taking direction down the incline plane as positive (sina = 1/5) :
O is a point at the bottom of a rough plane inclined at an angle a to the horizontal. Coefficient of friction between AB is and between BO is. B is the mid–point of AO. A block is released from rest at A. Then identify which graphs are correct during motion of block from point A to O taking direction down the incline plane as positive (sina = 1/5) :
Physics-General
Physics-
ABC is a triangle in vertical plane. Its two base angles ÐBAC and ÐBCA are 45º and tan–1 (1/3) respectively. A particle is projected from point A such that it passes through vertices B and C. Find angle of projection in degrees:
ABC is a triangle in vertical plane. Its two base angles ÐBAC and ÐBCA are 45º and tan–1 (1/3) respectively. A particle is projected from point A such that it passes through vertices B and C. Find angle of projection in degrees:
Physics-General
Chemistry-
The space between nucleus and electrons in an atom is
The space between nucleus and electrons in an atom is
Chemistry-General
Chemistry-
Rutherford’s experiment on scattering of alpha particles showed for the first time that atom has:
Rutherford’s experiment on scattering of alpha particles showed for the first time that atom has:
Chemistry-General
Chemistry-
The cations and anions formed as a result of electron transfer are drawn towards each other due to the electrostatic force (coulomb force) of attraction. They form an ionic bond or an electrovalent bond. The bond between two elements is ionic if the EN difference between them is greater than 1.7. The number of electrons transferred during an ionic bond formation is known as an electrovalency. Compounds containing ionic bonds are called ionic compounds. Examples of ionic compounds are NaCl(Na+Cl–), CaO(Ca2+O2–), MgO(Mg2+O2–) and MgCl2 
.
Element X is strongly electropositive and the element Y is strongly electronegative. Both are univalent. The compound formed would be:
The cations and anions formed as a result of electron transfer are drawn towards each other due to the electrostatic force (coulomb force) of attraction. They form an ionic bond or an electrovalent bond. The bond between two elements is ionic if the EN difference between them is greater than 1.7. The number of electrons transferred during an ionic bond formation is known as an electrovalency. Compounds containing ionic bonds are called ionic compounds. Examples of ionic compounds are NaCl(Na+Cl–), CaO(Ca2+O2–), MgO(Mg2+O2–) and MgCl2 .
Element X is strongly electropositive and the element Y is strongly electronegative. Both are univalent. The compound formed would be:
Chemistry-General
Chemistry-
An aqueous solution of a salt Compound A is :
A)gives a white precipitate
B)with sodium chloride solution The filtrate gives a black precipitate
C)when H2S is passed into it Compound (B) dissolves in hot water and the solution gives a yellow precipitate
D)on treatment with sodium iodide The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating Identify the compounds (A) to (D)
An aqueous solution of a salt Compound A is :
A)gives a white precipitate
B)with sodium chloride solution The filtrate gives a black precipitate
C)when H2S is passed into it Compound (B) dissolves in hot water and the solution gives a yellow precipitate
D)on treatment with sodium iodide The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating Identify the compounds (A) to (D)
Chemistry-General
