Explore topic-wise InterviewSolutions in Current Affairs.

Take the z axis as vertical and the xy plane as horizontal. A particle A is projected at $4\sqrt{2}$ m/s at an angle of ${45}^{\circ }$ to the horizontal, in the xz plane. Particle B is projected at 5 m/s at an angle $\theta =ta{n}^{-1}\left(\frac{4}{3}\right)$ to y axis, in the yz plane. Which of the following is not correct for the velocity of B with respect to A?

If $P,Q,R$ are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?

A solid non conducting sphere of radius $R$ is charged uniformly. At what distance from its surface is the electrostatic potential becomes half of the potential at the centre?

An object is moving in a straight-line path has a velocity of $40\text{m/s}$ at some instant. After $10\text{s}$, its velocity changed to $80\text{m/s}$. What is the average acceleration of the ball during this time interval?

The electrical energy across the capacitor in the LC circuit, oscillates with an angular frequency of -



$L$ is the inductance and $C$ is the capacitance.

Consider a particle moving in simple harmonic motion according to the equation $x=2.0cos(50\Pi t+ta{n}^{-1}0.75)$

where x is in centimeter and t in second. The motion is started at t = 0. (a) When does the particle come to rest for the second time?

A purse at radius 2.00 m and a wallet at radius 3.00 m travel in uniform circular motion on the floor of a merry-go-round as the ride turns. They are on the same radial line. At one instant, the acceleration of the purse is (2.00 m/ $s^2$)$\hat{i}$ + (4.00 m/ $s^2$)$\hat{j}$ . At that instant and in unit-vector notation, what is the acceleration of the wallet? IIT JEE- 2001

When heat in given to a gas in an isobaric process, then

For the propped cantilever shown in the figure. Influence line for reaction at the propped end is given by $y_1=f\left(x\right).$







The influence line ordinate $\left(y_2\right)$ for moment at A is given by the equation

Find the frequency of a wave whose time period is $0.5s$.

Figure shows the shape of part of a long string in which transverse waves are produced by attaching one end of the string to tuning fork of
frequency 250 Hz. What is the velocity of the waves?

The value of ${}^{\prime }{Z}^{\prime }$ such that no current flows in branch $Y$ will be

Identify the material which is used as a piezoelectric material and has made possible to develop extremely accurate clocks, modern radio and television broadcasting.

A ball is thrown vertically upwards at time t = 0 s, and reaches a height of 10 m. At what time will the ball hit the ground?

Consider the circuit shown in the figure below.



Which of the following statement is correct?

A point object is placed 20 cm left of a convex lens of focal length f = 5 cm (see the figure). The lens is made to oscillate with small amplitude A along the horizontal axis. The image of the object will also oscillate along the axis with.

A hollow cylinder has a charge $q\text{C}$ within it placed at the centre. If the electric flux associated with the curved surface $B$ is $\varphi$, the flux linked with the plane surface $A$ will be

According to De Broglie the electron in n=3 of Hydrogen atom will look like

The escape velocity from a planet is $v_o$. The escape velocity from another planet having twice the radius, but of same density will be -

When a mass m is hung from the lower end of a spring of negligible mass, an extension x is produced in the spring in equilibrium. The mass is set into vertical oscillations. The time period of oscillation is

4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is

$5.0J{K}^{-1}mo{l}^{-1}.$ If the speed of sound in this gas at NTP is $952m{s}^{-1},$ then the heat capacity at constant pressure is

(Take gas constant R = 8.3 $J{K}^{-1}mo{l}^{-1}$ )

What is the wavelength of light for the least energetic photon emitted in the Lyman series of the hydrogen spectrum. (take hc = 1240 eV nm)

The pressure wave in a closed organ pipe of length $40\text{cm}$ is given by $p=5\sin \left(\frac{2\pi x}{32}\right)\cos \left(50\pi t\right)$ where $x,p$ and $t$ are in $\text{cm},{\text{N/m}}^2$ and seconds respectively. The pressure nodes are located at which of the following distances along the pipe (from the open end) ?

____________ is a device which converts electrical energy into mechanical energy.

Water flows through a horizontal tube as shown in figure. If the difference of heights of water column in the vertical tubes is $4\text{cm}$, and the cross-sectional area $A_1$ and $A_2$ are $4{\text{cm}}^2$ and $2{\text{cm}}^2$ respectively, find the rate of flow of water across any section.
Take $g=9.8{\text{m/s}}^2,\sqrt{2613.33}=51.12$ for calculation.

An ice cream has a marked value of 700 kcal. How many kilowatt hour of energy will it deliver to the body as it is digested

De broglie equation describes the relationship of wavelength associated with the motion of an electron and its

Two identical cylindrical vessels, each of base area A, have their bases at the same horizontal level. They contain a liquid of density $\rho$. In one vessel, the height of the liquid is $h_1$ and in the other $h_2>h_1$. When the two vessels are connected, the work done by gravity in equalizing the levels is

In the motion of a projectile freely under gravity, its

A particle of mass $m$ and velocity $v_0$ is fired at a solid cylinder of mass $M$ and radius $R$. The cylinder is initially at rest and is mounted on a fixed horizontal axle that runs through the centre of mass. The line of motion of the particle is perpendicular to the axle and at a distance $d$ (less than $R$) from the centre. If the particle sticks to the surface of the cylinder, then angular speed of the system just after the particle sticks is

A block of ice at $-{12}^{\circ }\text{C}$ is slowly heated and converted into steam at ${100}^{\circ }\text{C}$. Which of the following curves best represents this event?

A car moves with a constant speed along a curved surface as shown. Which of the following pair best represents the directions of velocity and acceleration of the car at the instant when the car is at lowest position and going up?

When temperature of a ferromagnetic material is decreased to $80\%$, what is the percentage change in its magnetic susceptibility?