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If voltage across a bulb rated 220 Volts,100 Watt drops by 2.5% of its rated value the percentage of the rated value by which the power would decrease is :
22
Aug
If voltage across a bulb rated 220 Volts,100 Watt drops by 2.5% of its rated value the percentage of the rated value by which the power would decrease is : 100 Watt drops by 2.5% of its rated value the percentage of the rated value by which the power would decrease is If voltage across [...]
In fig. the block of mass M is at rest on the floor . At what acceleration with which should a boy of mass m climb along the rope of negligible mass so as to lift the block from the floor?
22
Aug
In fig. the block of mass M is at rest on the floor . At what acceleration with which should a boy of mass m climb along the rope of negligible mass so as to lift the block from the floor? In fig. the block of mass M is at rest on the floor . [...]
Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5Ω. The power loss in the wire is
22
Aug
Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5Ω. The power loss in the wire is are connected as shown.The voltmeter V will record a reading of one [...]
A filament bulb 500 W, 100 V is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W . The value of R is :-
22
Aug
A filament bulb 500 W, 100 V is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W . The value of R is :- 100 V is to be used in a 230 V main supply. When a [...]
Two blocks of masses of 0.2 kg and 0.5 kg which are placed 22m apart on a horizontal surface (mu = 0.5) are acted uponby two forces of magnitude 3 Neach as shown in figure in time t = 0 Then the time t at which they collide with each other is
22
Aug
Two blocks of masses of 0.2 kg and 0.5 kg which are placed 22m apart on a horizontal surface (mu = 0.5) are acted uponby two forces of magnitude 3 Neach as shown in figure in time t = 0 Then the time t at which they collide with each other is B and C [...]
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B and C is 1/2. the maximum value of mass of block D so that the blocks A ,
B and C move without slippping over each other is ,
B and C of equal mass m are placed one over the other on a smooth horizontal ground as shown in figure. Coefficient of friction between any two blocks of A ,
Three blocks A ,
Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be
22
Aug
Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be are connected [...]
The charge flowing through a resistance R varies with time t as Q=at−bt2. The total heat produced in R is
22
Aug
The charge flowing through a resistance R varies with time t as Q=at−bt2. The total heat produced in R is The charge flowing through a resistance R varies with time t as Q=at−bt2. The total heat produced in R is August 22, 2020 Category: Chapter 22 - Current Electricity , NEET Last 32 Years Solved [...]
Two blocks of mass 10kg and 30kg are kept as shown in the figure. The surface between the block is fricitional while the ground is smooth. A horizontal force of magnitude 60N is applied horizontally on the upper block. Find the frictional force on block of mass 30kg ?
22
Aug
Two blocks of mass 10kg and 30kg are kept as shown in the figure. The surface between the block is fricitional while the ground is smooth. A horizontal force of magnitude 60N is applied horizontally on the upper block. Find the frictional force on block of mass 30kg ? the time of flight is found [...]
Two small rings O and O’ are put on two vertical stationary rods AB and A’B’, respectively. One end of an inextensible thread is tied at point A’. The thread passes through ring O’ and its other end is tied to ring O. Assuming that ring O’ moves downwards at a constant velocity v1, then velocity v2 of the ring O, when ∠AOO’=α
22
Aug
Two small rings O and O’ are put on two vertical stationary rods AB and A’B’, respectively. One end of an inextensible thread is tied at point A’. The thread passes through ring O’ and its other end is tied to ring O. Assuming that ring O’ moves downwards at a constant velocity v1, then [...]
Two batteries, one of emf 18 volts and internal resistance 2Ω and the other of emf 12 volt and internal resistance 1Ω, are connected as shown.The voltmeter V will record a reading of:
22
Aug
Two batteries, one of emf 18 volts and internal resistance 2Ω and the other of emf 12 volt and internal resistance 1Ω, are connected as shown.The voltmeter V will record a reading of: are connected as shown.The voltmeter V will record a reading of one of emf 18 volts and internal resistance 2Ω and the [...]