A straight wire of mass 300 g and length 1.5 m carries a current of 2 A. It is suspended in mid air by a uniform horizontal magnetic field. The magnitude of the magnetic field is
(Neglect the earth's magnetic field and \( g = 10 \text{ m/s}^2 \))

As astronomical telescope of ten fold angular magnification has a length of 44 cm. The focal length of the objective is:

In an unbiased p-n junction, holes diffuse from the p-region to n-region because

The wavelength of emitted wave due to energy transition in hydrogen atom from n = 3 to n = 2 energy level will be

A parallel plate air capacitor consists of two circular plates of diameter 4 cm. At what distance should the plates be held so as to have the same capacitance as that of a sphere of diameter 16 cm?

If a p-n junction is forward biased, then what is the direction of diffusion and drift current across the junction?

A uniform wire of resistance 12 \( \Omega \) is cut into three pieces in the ratio of length 1 : 2 : 3. Now the three pieces are connected to form a triangle. A cell of emf 8 V and internal resistance 5 \( \Omega \) is connected across the highest of the three resistors. The current through the circuit is:

Resistivity of a conductor depends on

Read the passage carefully and answer the questions based on the passage:
Pollen pistil interaction involves all events from the landing of pollen grains on the stigma until the pollen tube enters the embryo sac (when the pollen is compatible). When a pollen tube grows through the style and enters into the ovules, it finally discharges two male gametes in one of the synergids. Syngamy and triple fusion are two fusion events occur in angiosperms. Thus, angiosperms exhibit double fertilization. The products of these fusions are the diploid zygote and triploid primary endosperm nucleus. Zygote develops into embryo and primary endosperm cell forms the endosperm tissue. The developing embryo passes through different stages before maturation.
Which of the following is not a stage of growing embryo in dicotyledon plants?

\(\text{R-CO-Cl} + \text{H}_2 \xrightarrow{\text{Pd-BaSO}_4} \text{R-CHO}\) Above reaction known as:

When a current of 5 A flows through an ammeter, it gives full deflection. The resistance of ammeter is 20 \(\Omega\). If the same ammeter is to be used for measuring a maximum current of 10 A, then the ammeter must be connected to a resistance of :

A cone, whose height is always equal to its diameter, is increasing in volume at the rate of \(40 cm^3 / sec\). The rate at which radius is increasing when circular base area is \(1 m^2\) is :

During the denaturation of proteins, which of the following bond/interaction is not broken?