- a upward.
- (g - a) upward.
- (g - a) downward.
- g downward.
Explanation:
Gravity is the only force acting on the stone when it is released. And, we know that gravity is always in the downward direction.
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A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10–7 ohm–meter and the current passing through it is 0.1 ampere; cross-section of the wire is 10–6 m2. The potential gradient along the potentiometer wire is
|
(a) |
(b) |
(c) |
(d) |
The resultant capacitance between A and B in the following figure is equal to
|
(a) 1 μF |
(b) 3 μF |
(c) 2 μF |
(d) 1.5 μF |
The 6563 Å line emitted by hydrogen atom in a star is found to be red shifted by 5 Å. The speed with which the star is receding from the earth is
|
(a) 17.29 × 109 m/s |
(b) 4.29 × 107 m/s |
(c) 3.39 × 105 m/s |
(d) 2.29 × 105 m/s |
The rate of disintegration was observed to be
disintegrations per sec when its half life period is 1445 years. The original number of particles are
|
(a) 8.9 |
(b) 6.6 |
(c) 1.4 |
(d) 1.2 |
If the distance between the plates of parallel plate capacitor is halved and the dielectric constant of dielectric is doubled, then its capacity will
|
(a) Increase by 16 times |
(b) Increase by 4 times |
|
(c) Increase by 2 times |
(d) Remain the same |
A cylindrical rod magnet has a length of 5 cm and a diameter of 1 cm. It has a uniform magnetisation of 5.30 × 103Amp/m3. What its magnetic dipole moment
|
(a) 1 |
(b) 2.08 |
(c) 3.08 |
(d) 1.52 |
In the following diagram the work done in moving a point charge from point P to point A, B and C is respectively as WA, WB and WC , then
|
(a) WA = WB = WC |
(b) WA = WB = WC = 0 |
(c) WA > WB > WC |
(d) WA < WB < WC |
Coherent sources are those sources for which
|
(a) Phase difference remain constant |
|
(b) Frequency remains constant |
|
(c) Both phase difference and frequency remains constant |
|
(d) None of these |