MHT CET Mock Test - 1 - JEE MCQ

Explanation:Semiconductors are materials that have electrical conductivity between conductors such as most metals and nonconductors or insulators like ceramics. Semiconductor material is used in the manufacturing of electrical components and used in electronic devices such as transistors and diodes.Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs etc

Explanation:for electromagnetic induction magnet and coil both may move but relative motion between must be present

Light from each point on a luminous object travels outward in all directions in straight lines. Light travels at very high speeds, but is not instantaneously everywhere. Light from a point object travels indefinitely until it collides with matter in its path to be partially absorbed and reflected.

When any body or particle moves in circular orbit centripetal force acts on it and to move the object centripetal acceleration is necessary. So, when a satellite moves in circular orbit the centripetal acceleration is provided by the gravitational attraction of the earth.

Total external resistance will be the total resistance of whole length of box. It should be connected between A and D.

In nuclear reactors, fission of uranium is carried out by bombarding  a slow moving neutron on uranium which results in emission of 3 more neutrons along with the byproducts  So, cadmium rods are used to absorb extra neutrons in order to achieve controlled chain reaction.

Earlier force between two particles is 
F=kq^1​q²​​/ r²
When distance is halved force becomes 
F′= kq₁​q²/(r/2)² ​​=4kq₁​q₂/r²​​=4F

The free body diagram of the person can be drawn as Let the person move down with an acceleration a then

60g- T = 60 ⇒ 60g -T_max = 60 a_min

Photo diode is used to detect light. 
In a reverse biased condition, the width of the depletion region increases as the applied reverse bias voltage increases across the diode. So, by applying a larger voltage, more of the incident photons are converted to electric current thereby increasing the efficiency.
In forward biased conditions, the width of the depletion region decreases so only a small portion of the incident photons get converted to electric current and hence the efficiency is less.
Hence photo diode in reverse biased condition detects light.

There are two depletion regions in a transistor, since there are two PN junctions.

oxidation state of Ag in tollen’s reagent is +1.

Ford-block elements, group number is equal to the number of electrons in (n - 1)d subshell + number of electrons in valence shell (nth shell).

Be(OH)₂ down the group solubility increase

If activation energy is high rate of reaction will decrease and reaction will be slow.

Ti²⁺,V³⁺,Cr⁴⁺ and Mn⁵⁺ show 1s²2s²2p⁶3s²3p⁶4s⁰3d² electronic configuration.

This is 1-phenyl propan-1-one.

Smaller the IE of Mg, easier the formation of Mg²⁺.
Greater the EA of O, easier the formation of O2^-.

adsorption is inversely proportional to the temperature. This is true for physical adsorption. In chemical adsorption due to the high energy of activation, the extent of adsorption increases initially and decreases as the temperature increases further.

Enzymes are biological catalyst, they catalize different chemical reactions in body.

cos105° + cos75°
= cos(90º + 15) + cos(90° - 15) 
= - sin15 + sin15 = 0

A circle is the set of points a fixed distance from a center point, 

Because, the element b in the domain A has no image in the co-domain B.

Let
X = TATANAGAR
Y = CALCUTTA
P(X) = P(Y) = 1/2
E – Two consecutive letters TA are visible.
Two consecutive letters from X are TA, AT, TA, AN, NA, AG, GA, AR

Two consecutive letters from Y are CA, AL, LC, CU, UT, TT, TA

∴ By Bayes Theorem,

We have:
limx→0 ln(1+ax)]/x=a
lim x→0 ln(1+ax)/ax=a
and then:
lim x→0 [ln(1+ax)-ln(1+bx)]/x
= a-b

As the curve goes from c to d and the equation is x = f(y)
So the shaded area is ∫(c to d)f(y)dy

Consider the given function.
lim x→0 ((1-x)ⁿ −1)/x)
This is 0/0 form.
So, apply L-Hospital rule,
lim x→0 [nx-1x(1-x)_^n-1 −0)]/1
lim x→ 0(-n(1-x)^n-1)
=-n