Which hormones promote the flowering in long day plants and also control sex expression in certain species?
Options
(a) ethylene (b) gibberellin (c) cytokinins (d) auxin
Correct Answer:
gibberellin
Explanation:
Gibberelins are growth […]
A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power […]
An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57×10⁻² T. If the value of e/m is 1.76×10¹¹ C/kg, the frequency of revolution of the electron is […]
For CE transistor amplifier, the audio signal voltage across the collector resistance of 2kΩ is 4V. If the current amplification factor of the transistor is 100 and the base resistance is 1kΩ, then the input […]
Photons with energy 5eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons […]
A 100Ω resistance and a capacitor of 100Ω reactance are connected in series across a 220V source. When the capacitor is 50% charged, the peak value of the displacement current is
Options
(a) […]
The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100V respectively in an L-C-R circuit. The power factor of this circuit is
Options
(a) 0.4 (b) 0.5 […]
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?
Options
(a) R=20 Ω, L=1.5 H, C=35 μF (b) R=25 Ω, L=2.5 H, C=45 μF […]
A filament bulb (500W,100V) is to be used in a 230V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500w. The value of R is
An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness […]
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