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The velocity acquired by a body moving with uniform acceleration is 30 m/s in 2 s and 60 m /s in 4 s. The initial velocity is a. zero b. 2 m/s c. 3 m/s d. 10 m/s
19
Sep
The velocity acquired by a body moving with uniform acceleration is 30 m/s in 2 s and 60 m /s in 4 s. The initial velocity is a. zero b. 2 m/s c. 3 m/s d. 10 m/s The velocity acquired by a body moving with uniform acceleration is 30 m/s in 2 s and [...]
First a set of n equal resistors of R each are connected in series to a battery of emf E and internal resistance R. A current I is observed to flow. Then, the n resistors are connected in parallel to the same battery. It is observed that the current is increased 10 times. What is ‘n’?
19
Sep
First a set of n equal resistors of R each are connected in series to a battery of emf E and internal resistance R. A current I is observed to flow. Then, the n resistors are connected in parallel to the same battery. It is observed that the current is increased 10 times. What is [...]
Between two stations, a train accelerates from rest uniformly at first, then moves with constant velocity, and finally retards uniformly to come to rest. If the ratio of the time taken is 1 : 8 : 1 and the maximum
19
Sep
Between two stations, a train accelerates from rest uniformly at first, then moves with constant velocity, and finally retards uniformly to come to rest. If the ratio of the time taken is 1 : 8 : 1 and the maximum a train accelerates from rest uniformly at first and finally retards uniformly to come to [...]
A 150 m long metal wire connects points A and B. The electric potential at point B is 50 V less than that at point A. If the conductivity of the metal is 60 × 10^6 mho/m then magnitude of the current density in the wire is equal to
19
Sep
A 150 m long metal wire connects points A and B. The electric potential at point B is 50 V less than that at point A. If the conductivity of the metal is 60 × 10^6 mho/m then magnitude of the current density in the wire is equal to 2 x and 4 x . [...]
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2 x and 4 x . Electrical contacts can be made to the block between opposite pairs of faces (for example ,
B - B : Left and right faces ,
B - B and C - C ). Between which two faces would the maximum electrical resistance be obtained ( A - A : Top and bottom faces ,
between the faces labelled A - A ,
C - C : Front and rear faces) ,
In figure shows a rectangular block with dimensions x ,
The position x of a particle varies with time (t) as x = at^2 – bt^3. The acceleration at time t of the particle will be equal to zero, where t is equal to a. 2a/3b b. a/b
19
Sep
The position x of a particle varies with time (t) as x = at^2 – bt^3. The acceleration at time t of the particle will be equal to zero, where t is equal to a. 2a/3b b. a/b The position x of a particle varies with time (t) as x = at^2 - bt^3. The [...]
A solid conductor has a cross section area 1 cm^2 and 2 cm^2 as shown in the figure. A current of 20 A entering at A. then
19
Sep
A solid conductor has a cross section area 1 cm^2 and 2 cm^2 as shown in the figure. A current of 20 A entering at A. then A solid conductor has a cross section area 1 cm^2 and 2 cm^2 as shown in the figure. A current of 20 A entering at A. then September [...]
The distance traveled by a particle in a straight line motion is directly proportional to t ^1/2, where t is the time elapsed. What is the nature of motion? a. Increasing acceleration. b. Decreasing
19
Sep
The distance traveled by a particle in a straight line motion is directly proportional to t ^1/2, where t is the time elapsed. What is the nature of motion? a. Increasing acceleration. b. Decreasing The distance traveled by a particle in a straight line motion is directly proportional to t ^1/2 where t is the [...]
The magnitude of displacement is equal to the distance covered in a given interval of time if the particle a. Moves with constant acceleration along any path b. Moves with constant speed
19
Sep
The magnitude of displacement is equal to the distance covered in a given interval of time if the particle a. Moves with constant acceleration along any path b. Moves with constant speed The magnitude of displacement is equal to the distance covered in a given interval of time if the particle a. Moves with constant [...]
Two wires each of radius of cross section r but of different materials are connected together end to end (in series). If the densities of charge charge carries in the two wires are in the ratio 1:4, the drift velocity of electrons in the two wires will be in the ratio:
19
Sep
Two wires each of radius of cross section r but of different materials are connected together end to end (in series). If the densities of charge charge carries in the two wires are in the ratio 1:4, the drift velocity of electrons in the two wires will be in the ratio: the drift velocity of [...]
The location of a particle is changed. What can we say about the displacement and distance covered by the particle? a. Both cannot be zero b. One of the two may be zero
19
Sep
The location of a particle is changed. What can we say about the displacement and distance covered by the particle? a. Both cannot be zero b. One of the two may be zero The location of a particle is changed. What can we say about the displacement and distance covered by the particle? a. Both [...]