JEE COMEDK Mock Test - 3 Free Online Test 2026
30 Questions MCQ Test COMEDK Mock Test Series - COMEDK Mock Test - 3
Two metallic blocks M1 and M2 of the same area of cross-section are connected to each other (as shown in the figure). If the thermal conductivity of M2 is K, then the thermal conductivity of M1 will be:
[Assume steady state heat conduction]
[Assume steady state heat conduction]
The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit?
When a wave traverses a medium, the displacement of a particle located at x at time t is given by y = a sin (bt - cx) where a, b and c are constants of the wave. The dimensions of b/c are the same as those of
Half-life of a radioactive substance A is 4 days. The probability of a nucleus that, from the given sample that it will decay in two half-lives is
Two bulbs consume the same power when operated at 200 V and 300 V respectively. When these bulbs are connected in series across a DC source of 400 V, then the ratio of power consumed across them is
One main scale division of a vernier calliper is 'a' cm and nth division of the vernier scale coincides with (n - 1)th division of the main scale. The least count of the callipers in mm is:
In the circuit shown in figure, A and B are two cells of the same emf, E and of internal resistances rA and rB, respectively. L is an ideal inductor and C is an ideal capacitor. The key K is closed. When the current in the circuit becomes steady, what should be the value of R so that the potential difference across the terminals of cell A is zero?
= R
A body is projected up a smooth inclined plane with velocity v from the point A as shown in the figure. The angle of inclination is 45° and the top is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of v? Length of the inclined plane is 20√2 m.
A fly wheel is accelerated uniformly from rest and rotates through 5 rad in the first second. The angle rotated by the fly wheel in the next second will be:
A charge Q is moving 
distance in the magnetic field 
Find the value of work done by 
work by magnetic force on the point charge is zero.The quantity of electricity required to liberate 112 cm3 of hydrogen at STP from acidified water is
When ether is exposed in air for sometime, an explosive substance produced is
Use of hot air balloons in sports and metereological observations is an application of
Which of the following does not give red ppt. with Fehling solution?
Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of
If the pressure on a NaCl structure is increased, then its co-ordination number will
The structure shown below is of which well-known drug molecule?
The metal ion (in gaseous state) with lowest spin-only magnetic moment value is
At 25°C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) is -3268 kJ mol-1 and -1300 kJ mol-1, respectively. The change in enthalpy for the reaction 3C2H2(g) → C6H6(l) is
are unit vectors and 
then the value of 
is equal toConsider A, B, C and D with position vectors 7î - 4ĵ + 7k̂, î - 6ĵ + 10k̂, -î -3ĵ + 4k̂ and 5î - ĵ + 5k̂ respectively. Then ABCD is a
If P(S) = 0.3, P(T) = 0.4, S and T are independent events, then P(S/T)=
How many different nine-digit numbers can be formed from the number 2, 2, 3, 3, 5, 5, 8, 8, 8 by rearranging its digit so that the odd digits occupy even positions?
The eccentricity of the hyperbola in the standard form 
passing through (3, 0) and (3√2, 2) is
passes through (3, 0) and (3√2, 2)
is
What is the solution of the differential equation 2x3y dy + (1 - y2)(x2y2 + y2 - 1) dx = 0?
A unit vector in xy-plane, which makes an angle of 45° with the vector 
and an angle of 60° with the vector 
, is
