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The order of magnitude of a number expressed in scientific notation is

1. 0

The PN junction diode is used as

When we throw an object while a hot air balloon is descending, does the object go up or down?

The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is

A particle is moving along x-axis and its position time graph is given below. What could be the possible velocity-time and acceleration-time graph? (All the curves in the graph are parabolic. Only the part between $t_1$ and $t_2$ is straight line.)

The speed of a molecule of gas in a cubical vessel of side $4\text{m}$ is $16\text{m/s}$. This molecule is constantly colliding with the wall of the container. The collision frequency will be

A boy is moving unidirectionally under the influence of constant power source. Its displacement in time '$t$' is proportional to

In Young's double slit experiment the slits are 0.5 mm apart and interference is observed on a screen placed at a distance of 100 cm from the slits. It is found that the 9th bright fringe and 3rd dark fringe from the centre are 9mm apart. What is the wavelength of light used?

The curve of angle of incidence versus angle of deviation shown below has been plotted for prism.

The value of angle $i_1$ in degrees is

A particle moves in a circle of radius 1 cm at speed given by v = 2t where v is in cm/s and t in seconds.

(a) Find the radial acceleration of the particle at t = 1 s.

(b) Find the tangential acceleration at t = 1 s.

(c) Find the magnitude of the acceleration at t = 1 s.

In the figure below, the switches $S_1$ and $S_2$ are closed simultaneously at $t=0$ and a current starts to flow in the circuit. Both the batteries have the same magnitude of the electromotive force (emf) and the polarities are as indicated in the figure. Ignore mutual inductance between the inductors. The current $I$ in the middle wire reaches its maximum magnitude $I_{max}$ at time $t=\tau$. Which of the following statement(s) is (are) true?

Figure shows the graph of angle of deviation $\delta$ versus angle of incidence $i$ for a light ray striking a prism. The prism angle is

The frequency of a light wave in a material is $2\times {10}^{14}\text{Hz}$ and wavelength is $5000\stackrel{\circ }{\text{A}}$. The refractive index of material will be

A ball rolls off the top of a stairway horizontally with a velocity of $5\text{m/s}$. Each step is $0.1\text{m}$ high and $0.1\text{m}$ wide. If $g=10{\text{m/s}}^2$ and the ball strikes the $n^{th}$ step, then find the value of $n$.

A monochromatic beam of light falls on $YDSE$ apparatus at some angle $\left(\text{Assume}\theta \right)$ as shown in figure. A thin sheet of glass of thickness $t$ is inserted in front of the lower slit $S_2$. The central bright fringe $(\text{path difference}=0)$ will be obtained

A proton, a deuteron and an $\alpha -$ particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If $r_p,r_d$ and $r_{\alpha }$ denote the radii of the trajectories of these particles respectively, then

Block A is kept on top of block B and moves leftwards with respect to B. Assume the friction to be present between the blocks. The direction of friction force on A by B, will be?

A body moving with uniform retardation covers 3km before it's speed is reduced to half of its initial value. It comes to rest in distance of 1) 1km 2) 2km 3) 3km 4) 1/2km

extension produced in a sprin is 5 cm ,when a 100 g mass is suspended from it. find:- 1. Spring constant K , 2.maximum P.E,3. if the mass is further extended and allowed to oscillate,what will be its velocity when it passes through mean position

A particle is released from rest from a height of $4h$, on a smooth track as shown in figure. When the particle reaches point $C$, then the normal reaction on it by the track is:

($C$ is the highest point on the circular part of the track)

A point charge +Q is placed at the centre of cube. Electric flux passing through each face of cube is



एक बिन्दु आवेश +Q को घन के केन्द्र पर रखा गया है। घन की प्रत्येक फलक से गुजरने वाला विद्युत फ्लक्स है

An alternating current is given by the equation $i=i_{1}cos\omega t+i_{2}sin\omega t$ . The r.m.s. current is given by

Two small rings, each of mass ${}^{\prime }{m}^{\prime }$, are connected to the block of same mass ${}^{\prime }{m}^{\prime }$ through an inextensible massless string of length ${}^{\prime }{l}^{\prime }$. Rings are constrained to move over smooth rod $AB$. Initially, the system is held at rest as shown in Figure. Let $u$ and $v$ be the velocities of ring and block, respectively when string makes an angle ${60}^{\circ }$ with the vertical.

A DC voltage source is connected across a.series R-C circuit. when steady state reaches, the ratio of energy stored in the capacitor to the total energy supplied by the voltage source is given by

(Assume that the circuit is initially relaxed)

The pressure $P$ of an ideal diatomic gas varies with its absolute temperature $T$ as shown in the figure. The molar heat capacity of the gas during this process is:

[$R$ is the gas constant]

The photoelectric threshold wavelength for potassium (work function being 2eV) is

The electric current in circuit is given by $I=I_o\left(\frac{t}{T}\right)$ some time. What is the rms current for the period $t=0$ to $t=T$?

A body covers one third of the distance with speed v, the next one third of distance with speed $\frac{3v}{2}$ and the remaining one third of the distance with speed $\frac{2v}{3}$. The average speed is



एक पिण्ड प्रथम एक तिहाई दूरी v चाल से, अगली एक तिहाई दूरी $\frac{3v}{2}$ चाल से तथा शेष एक तिहाई दूरी $\frac{2v}{3}$ चाल से तय करता है। औसत चाल है