Explore topic-wise InterviewSolutions in Current Affairs.

Identify the type of mirror used here.

The pressure on a square plate is measured by measuring the force on the plate and the length of the sides of the plate. If the maximum error in measurement of force and length are $4\%$ and $2\%$ respectively, then the maximum percentage error in the measurement of pressure is

The pitch of a screw gauge is $2\text{mm}$ and there are $100$ divisions on the circular scale. In measuring the diameter of a sphere, there are $6$ divisions on the linear scale and $40$ divisions on circular scale coinciding with the reference line. The diameter of the sphere is:

A uniform chain of length l is placed on the table in such a manner that its l' part is hanging over the edge of table without the chain sliding. If the coefficient of friction between the chain and the table is $\mu$ then find the maximum length of chain l' that can hang without the entire chain slipping.

For a body to escape from earth, angle from horizontal at which it should be fired is

One end of a massless spring of spring constant 100 N/m and natural length 0.5 m is fixed and the other end is connected to a particle of mass 0.5 kg lying on a frictionless horizontal table. The spring remains horizontal. If the table is made to rotate at an angular velocity of 2 rad/s, find the elongation of the spring.

The plates of a parallel-plate capacitor are made of circular discs of radii 5.0 cm each. If the separation between the plates is 1.0 mm, what is the capacitance ?

A tube of length $L$ is filled completely with an incompressible liquid of mass $M$ and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity $\omega$. The force exerted by the liquid at the other end is -

For a car moving on a straight line with initial speed $u$, the minimum distance over which it can be stopped is $s$. If it's initial speed becomes $nu$, what will be the minimum distance over which it can be stopped? Assume constant braking force.

A moving coil galvanometer of resistance $20\Omega$ gives a full scale deflection when a current of $1\text{mA}$ is passed through it. It is to be converted into an ammeter reading $20\text{A}$ on full scale. But the shunt of $0.005\Omega$ only is available. What resistance should be connnected in series with the galvanometer coil?

A simple pendulum is made of a bob which is a hollow sphere containing mercury, suspended by a means of a wire. If mercury is drained off continuously the period of the pendulum will

A) remain unchanged.

B) first increase, then decrease

C) decreases.

D) become erratic

and Why?

Two blocks are connected over a massless pulley as shown in figure. The mass of block A is $10kg$ and the coefficient of kinetic friction is $0.2$. Block A slides down the incline at constant speed. The mass of block B in $kg$ is

Two cars $A$ and $B$ are travelling in the same direction with velocities $v_1$ and $v_2$ $(v_1>v_2)$. When the car $B$ is at a distance $d$ ahead of the car $A$, the driver of the car $A$ applied the brake producing a uniform retardation $a$. There will be no collision if

A charge having magnitude Q is divided into two parts q and (Q-q) which are held a certian distance r apart. The force of repulsion between the two parts will be maximum if the ratio $\frac{q}{Q}$ is

Three blocks of masses 2 kg, 3 kg and 5 kg are connected to each other with light string and are then placed on a frictionless surface as shown in the figure. The system is pulled by a force F = 10 N,, then tension $T_1=$

From a disc of radius R and mass M, a circular hole of diameter R, whose rim passes through the centre is cut. What is the moment of inertia of the remaining part of disc about a perpendicular axis, passing through the centre?

Find acceleration of 3kg block? Given string and pulleys are massless. Pulley and wedge is frictionless and wedge is fixed.

A metal sphere of mass m , radius r and specific heat c is rotated about an axis passing through its centre at a speed of n rotations per second. It is suddenly stopped and 50% of its energy is used in increasing its temperature. Then rise in temperature of the sphere is

Four squares plates $A,B,C$ and $D$ having densities ${\sigma }_1,{\sigma }_2,{\sigma }_3$ and ${\sigma }_4$ are kept as shown in figure. If ${\sigma }_1=0.5{\sigma }_2;{\sigma }_2=2{\sigma }_3;{\sigma }_3=\frac{{\sigma }_4}{4}$, then location of centre of mass of the system is given by

Assertion (A): Osmosis is a biological process

Reason (R): Osmosis is a special type of diffusion of water which occurs through differentially permeable membrane

The friction coefficient between the board and the floor shown in figure (6-E7) is $\mu .$ Find the maximum force that the man can exert on the rope so that the board does not slip on the floor.

In the photoelectric effect experiment, if v is frequency of radiation and I is intensity in terms of number of photons incident per second per unit area, then match the following

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{(A) If v increased keeping I and work function constant}& \text{(p) Stopping potential increases}\\ \text{(B) If I is increased keeping v and work function constant}& \text{(q) Saturation current increases}\\ \text{(C) If I is decreased keeping v and work function constant}& \text{(r) Maximum kinetic energy of photoelectron increases}\\ \text{(D) Work function is decreased keeping v and I constant}& \text{(s) Stopping potential remains same}\end{array}$

Consider the situation shown in figure. Initially, the spring is unstretched when the mass $m$ is released from rest. Assuming no friction in the pulley, find the maximum extension in the spring.

A thin circular ring of mass $M$ and radius $r$ is rotating about its axis with a constant angular velocity $\omega$. Four objects each of mass $m$ are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be

Let's say I have the following configuration. There is one square with 2 circles of equal radii with their centers at the corners of the square.

What will be the number of circles within this square?

In essence, what will be the ${}^{\prime }{Z}_{eff}^{\prime }$ for this square unit cell? Multiply the answer by 10 and type it in.

A block of mass $m$ on a rough horizontal surface is acted upon by two forces as shown in figure. For equilibrium of block, the coefficient of friction between block and surface is

The ratio of the inertial mass to gravitational mass is equal to

A.1/2

B.1

C.2

D. No fixed

Statement 2: Pressure is a Scalar Quantity.

A boat goes across a river in shortest possible time with a velocity $12km/h$ . The magnitude of its resultant speed in flowing water is $13km/h$. The magnitude of velocity of water flow in the river is

Light is incident from air on oil at an angle of ${30}^{\circ }.$ After moving through oil-1 and another medium oil-2, it enters glass and then it enters water. If the refractive indices of glass and water are 1.5 and 1.3, respectively, find the angle which the ray makes with normal in water.

What will be the phase difference between bigger pendulum (with time period 5T/4 )and smaller pendulum (with time period T) after one oscillation of bigger pendulum?

How many quadrants are made by the combination of lines shown in the figure:

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A spring of force constant 10 N/m has an initial stretch 0.20 m. In changing the stretch to 0.25 m, the increase in potential energy is about

Mr.Verma (50 kg) and Mr.Mathur (60 kg) are sitting at the two extremes of a 4 m long boat (40 kg) standing still in water.To discuss a mechanics problem,they come to the middle of the boat.Neglecting friction with water,how far does boat move on the water during the process ?

The power radiated by a black body is $P$ and it radiates maximum energy at the wavelength ${\lambda }_o$. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $\frac{3}{4}{\lambda }_o$, the power radiated by it will increase by a factor of

An electric dipole of length 2cm is placed with it's axis making an angle of 60° to a uniform electric field of 10^5 N-C-1.If it experiences a torque of 8√3 N-m, calculate

(i) magnitude of the charge on the dipole.

(ii) potential energy of the dipole.

The velocity v of a particle at time t is given by v=at+ b/t+ c where a,b,c are constants . What will be the dimensions of a,b and c

Three rods made of the same material having the same cross section have been joined as shown in figure. Each rod is of the same length. The left and right ends are kept at $0^{\circ }\text{C}$ and ${90}^{\circ }\text{C}$ respectively. The temperature of the junction of the three rods will be

A satellite does not need any fuel to circle around the earth why?

When does the body come back to its starting point?