MHT - CET MCQ

Logic circuit shows the inputs A, Band C. The output Y is '0' (zero) when ______.

In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the collector current. Then change in the base current is ____________.

If the mass of the electron is reduced to half, the Rydberg constant ______.

When a light of wavelength 4000 Å falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength 6000 Å is sufficient for photo emission. The work functions of the two emitters are in the ratio of ____________.

In a circuit L, C and R are connected in series with an alternating voltage source of f. When current in the circuit leads the voltage by 45°, the value of C ____________.

A sound wave has a frequency of 500 Hz and a velocity of 350 m/s. The distance between the two particles having a phase difference of 60° is near ______

Two identical circular loops of metal wire are lying on a table without touching each other. Loop-A carries a current which increases with time. ln response, the loop-B ____________.

A current loop in a magnetic field ____________.

In the measurement of a resistance by the Wheatstone bridge, the known and the unknown resistance are interchanged to eliminate ____________.

In a metre bridge experiment. the ratio of the left-gap resistance to right gap resistance is 2: 3. The balance point from the left is ______.

In Young's experiment for the interference of light, the separation between the silts is d and the distance of the screen from the slits is D. If D is increased by 0.6% and d is decreased by 0.2%, then for the light of a given wavelength, which one of the following is true?

"The fringe width  ____________."

A thin transparent sheet is placed in front of a slit in Young's double slit experiment. The fringe width will ____________.

A parallel beam of fast-moving electrons is incident perpendicular on a narrow slit. The distance between slit and screen is large. If the speed of the incident electrons is increased then which one of the following statements is correct?

A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air colunm in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s.

For the stationary wave,

y = 8sin(6.25πx) cos(96πt) metre, the distance between a node and the next antinode is ____________.

A particle executing S.H.M. has amplitude 0.01 m and frequency 60 Hz. The maximum acceleration of the particle is ____________.

Among the amount of heat absorbed and the amount of work done by a system, ______

Out of 20 J of radiant energy incident on a surface, the energy absorbed by the surface is 4 J and the energy reflected is 8 J. Then, coefficient of transmission of the body is ____________.

The temperature at which the molecules of nitrogen will have the same r.m.s. velocity as the molecules of oxygen at 327° C is ____________.

Two rain drops falling through air have radii in the ratio 1 : 2. They will have terminal velocity in the ratio ______.

In motors, more viscous oil is used in summer than in winter due to ____________.

A water barrel stands on a table of height 'h'. A small hole is made on the wall of barrel at its bottom. If the stream of water coming out of the hole strikes the ground at horizontal distance 'R' from the table, the depth 'd' of water in the barrel is ______.

A donor impurity results in ______.

For convex mirrors, whatever may be the position of the object, the image formed is always on the ______.

A train blowing the whistle moves with a constant velocity 'V' away from an observer standing on the platform. The ratio of the natural frequency of the whistle 'n' to the apparent frequency is 1.2 : 1. If the train is at rest and the observer moves away from it at the same velocity 'V', the ratio of 'n' to the apparent frequency is ______.

A satellite is to revolve round the earth in a circle of radius 9600 km. The speed with which this satellite be projected into an orbit, will be ______.

Three equal masses each of 50 g, are placed at the corners of a right angled isosceles triangle whose two equal sides are 5 cm each. The position of the centre of mass of the system is ____________.

The v-t graph of an athlete is shown below. The distance travelled by him between t = 0 and t = 18 s is

A random variable X has the following probability distribution:

X = x	–1	0	1	2	3	4
P(X = x)	0.25	2k	0.1	k	0.15	2k

Then, the expected value of X is ______.

The c.d.f. of a discrete r.v. x is

x	0	1	2	3	4	5
F(x)	0.16	0.41	0.56	0.70	0.91	1.00

Then P(1 < x ≤ 4) = ______

Area bounded by the curve xy = 4, X-axis between x = 1, x = 5 is ______.

The minimum value of z = 7x + 9y subject to 3x + y ≤ 6, 5x + 8y ≤ 40, x ≥ 0, y ≥ 2 is ______.

The constraints of an LPP are 7 ≤ x ≤ 12, 8 ≤ y ≤ 13. Determine the vertices of the feasible region formed by them.

If the origin and the points P(2, -7, 5), Q(2, 3, - 5) and R(x, y, z) are co-planar, then ______ 

The direction cosines of a line which is perpendicular to both the lines whose direction ratios are -2, 1, -1 and -3, -4, 1 are ______ 

(p ∧ ∼q) ∧ (∼p ∧ q) is a ______.

The contrapositive of (p ∧ r) → q is ______.

If A = {x, y, z}, B = {1, 2}, then the total number of relations from set A to set B are ______.

A die is thrown nine times. If getting an odd number is considered as a success, then the probability of three successes is ______

In a series of observations, coefficient of variation is 25 and mean is 20, then the variance is ______.

The angle between the lines x sin 60° + y cos 60° = 5 and x sin 30° + y cos 30° = 7 is ______ 

Which among the following monomers is used to prepare Teflon?

Which of the following is used as a substitute for wool?

Which of the following amino acid is an essential amino acid?

Which among the following reagents is used to confirm the presence of carbonyl group in glucose?

The following compound is a/an ____________.

The number of α-H atoms in butanal is ____________.

Which of the following compounds does NOT undergo aldol condensation?

The number of σ bonds in carbolic acid is ______.

What is the major product obtained in the sulphonation of chlorobenzene with concentrated sulphuric acid?

Elements from atomic number 104 to 118 are called as ____________.

Which element among the following lanthanoids has the smallest atomic radius?

Which of the following has completely filled d orbital in its ground state?

Which among the following catalysts is used in manufacture of sulphuric acid by contact process?

Identify the correct decreasing order of oxidizing power.

The potential energy of the transition state is ____________.

If time required to decrease concentration of reactant from 0.8 M to 0.2 M is 12 hours, the half life of this first order reaction is ____________.

Which of the following metals does NOT displace zinc from it's solution?

Find INCORRECT statement with reference to NICAD cell.

Identify the correct decreasing of relative tendency of metals to undergo oxidation from following.

For a particular reaction, the system absorbs 8 kJ of heat and does 2.5 kJ of work on its surrounding. What will be the change in internal energy of the system?

A system absorbs 900 J of heat and does work. The change in internal energy (∆U) for the process is +460 J. The work done by the system is ____________.

Which one of the following is NOT an intensive property?

Which of the following equations is NOT correct for van't Hoff factor?

What happens when isotonic solution of A (molecular weight 342) and B (molecular weight 60) are separated through semipermeable membrane?

The coordination number of each sphere in bcc lattice is ____________.

Calcite and ____________ are two forms of calcium carbonate.

Which of the following is an aromatic compound?

Which of the following is the INCORRECT match?

The critical temperature of a substance is the temperature ____________.

Castner-Kellner cell is used in the preparation of ____________.

Which of the following is NOT SI unit?