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A 250 turn rectangular coil of length $2.1 \text{ cm}$ and width $1.25 \text{ cm}$ carries a current of $85 \, \mu\text{A}$ and subjected to the magnetic field of strength $0.85 \text{ T}$. Work done for rotating the coil by $180^{\circ}$ against the torque is:
Ionized hydrogen atoms and $\alpha$-particles with the same momenta enter perpendicular to a constant magnetic field, $B$. The ratio of their path radii $r_H : r_\alpha$ will be:
Which of the following statements is correct?
Hydrocolloid carrageen is obtained from:
In oogamy, fertilization involves:
Which of the following is the correct match?
An LED is constructed from a p-n junction diode using GaAsP. The energy gap is $1.9 \text{ eV}$. The wavelength of the light emitted will be equal to:
A moving coil galvanometer has a resistance of $50\ \Omega$ and gives full scale deflection for $10\ \text{mA}$. How could it be converted into an ammeter with a full scale deflection for $1\ \text{A}$?
Sexual reproduction in Spirogyra is an advanced feature because it shows:
The phenetic classification of organisms is based on:
Identify the incorrect pair regarding the classification of Pteridophytes:
A step-down transformer connected to an AC mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
A galvanometer has 30 divisions and a sensitivity $16\ \mu\text{A/div}$. It can be converted into a voltmeter to read $3\ \text{V}$ by connecting (approximately):
Cycas have two cotyledons but are not included in angiosperms because of:
A student observed algae with chlorophyll 'a', 'd', and phycoerythrin. It should belong to:
Water is essential for Bryophyta:
When one CO2 molecule is fixed, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase of the Calvin cycle?
The products of light reaction in photosynthesis are:
For the circuit shown in the figure, the time constant is:
The correct order of atomic radii in group 13 elements is