There are N cells in the circuit of figure. The emf and internal resistance of each cell is E and rrespectively. The points A and B in the circuit divide the curit into n and (N-n) cells. The current in the circuit is
1. E/r
There are N cells in the circuit of figure. The emf and internal resistance of each cell is E and rrespectively. The points A and B in the circuit divide the curit into n and (N-n) cells. The current in the circuit is
1. E/r
Subtopic: Grouping of Cells |
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The earth’s magnetic field at a certain place has ahorizontal component of 0.3 G and total strength 0.5 G. Find angle of dip in tan-1.
1. δ =tan-1
Subtopic: Earth's Magnetism (OLD NCERT) |
52%
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The force F is given by expression F = Acos(Bx) + Csin(Dt), where x is the displacement and t is the time. Then dimensions of are the same as that of:
1. velocity [LT-1]
2. angular velocity [T-1]
3. angular momentum [ML2T-1]
4. velocity gradient [T-1]
Subtopic: Dimensions |
80%
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The thermo emf of a thermocupule varies with the temperature θ of the hot junction as
E= aθ +bθ2 volt Where the ratio (a/b) is 700 °C. If the cold junction is kept at 0 °C, then the neutral temperature is
E= aθ +bθ2 volt Where the ratio (a/b) is 700 °C. If the cold junction is kept at 0 °C, then the neutral temperature is
1. 700 °C
Subtopic: Calorimetry |
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The wire shown in figure carries a current of 32 A. If r =3.14 cm, the magnetic field at point P will be
1. 1.6×10-4T
Subtopic: Magnetic Field due to various cases |
55%
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Carbon, silicon and germanium are semiconductors having four valance electrons. If their respective band gap energies between conduction and valence band are (Eg)C, (Eg)Si, (Eg)Ge. Then
Subtopic: Energy Band theory |
60%
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Assertion: In an elastic collision between two bodies, the energy of each body is conserved.
Reason: The total energy of an isolated system is conserved.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Collisions |
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Assertion: A body can be at rest even when it is under the action of any number of external forces.
Reason: Vector sum of all the external forces is zero.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Newton's Laws |
63%
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