List of top Questions asked in COMEDK UGET

If the line px + qy = 0 coincides with one of the lines given by $ax^2 + 2hxy + by^2 = 0$, then

$AB$ and $CD$ are $2$ line segments ; where $A(2,3,0),B (6, 9, 0), C(-6, -9, 0). P $ and $Q$ are midpoint of $AB$ and $CD$, respectively and $L$ is the midpoint of $PQ$. Find the distance of $L$ from the plane $3x + 4z + 25 = 0$

The radius of an atom is $300\,pm$. If it crystallizes in a face-centered cubic lattice, length of the edge of the unit cell is

Sodium dissolves in liquid $NH_3$ to give a deep blue solution. This is due to

A 150 watt bulb emits light of wavelength 6600 $?$ and only 8% of the energy is emitted as light. How many photons are emitted by the bulb per second?

Schottky defect in crystals is observed when

In the following sets of ions, which one is not isoelectronic with the rest of the species? $ { O^{2-}, F^- , Na, Mg^{2+}, Al^{3+}, Ne} $

The reaction, $ { CH_3CH_2I + KOH_{(aq)} -> CH_3CH_2OH + KI}$ is classified as

The magnetic properties of a magnet is lost at its

A policeman on duty detects a drop of $15 \%$ in the pitch of the horn of a motor car as it crosses him. If the velocity of sound is $330 \, m \, s^{-1}$ , calculate the speed of the car.

A concave mirror forms an enlarged, erect, virtual image of an object, only when the object is placed

The ratio of $ \frac{C_P}{C_V}$ for a diatomic gas is

Two boys are standing at ends $A$ and $B$ of a ground where $AB = 200\, m$. The boy at B starts running in a direction perpendicular to $AB$ with a speed of $6\, m \,s^{-1}$? The boy at A starts simultaneously with a velocity of $10 \, m \, s^{-1}$ and catches the other at time t where the time $t$ is

The centre of mass of a system of two bodies of masses $M$ and $m, (M > m)1$ separated by a distance $d$ is

What is the dimensional formula for universal gravitational constant $G$ ?

In an inelastic collision, which of the following is true?

The increase in the height of the tower of height $200\,m$ to get its coverage range tripled is

A proton and helium nucleus are shot into a magnetic field at right angles to the field with same kinetic energy. Then the ratio of their radii is

Which one of the following represents uniform motion ?

The universal gas law $\left( \frac{PV }{T} = { constant} \right)$ is applicable to

A hospital uses an ultrasonic scanner to locate tumors in a tissue. The operating frequency of the scanner is $4.2 \, MHz$. The speed of sound in a tissue is $1.7 \, km \, s^{-1}$. The wavelength of sound in the tissue

The $TV$ signals have a bandwidth of $3.7\, MHz$. The number of $TV$ channels that can be accommodated with a band of $3700 \,GHz$ is

For $S_N1$ reaction, the order of reactivity of haloalkanes is

An orbital with $n = 3, l = 1$ is designated as

A crystalline solid has $A^-$ ions at the corners and face centres whereas $B^+$ ions are at the body centre and edge centres of the unit cell. The simplest formula of the compound will be