MP Police SI (Technical) Mock Test - 2 - MP Police SI MCQ

The conversion of a solid directly into vapors is called sublimation.

Sublimation: It is the conversion of a solid directly into vapors. Sublimation takes place when the boiling point is less than the melting point.

The heat required to change a unit mass of solid directly into vapors at a given temperature is called the heat of sublimation at that temperature.

Phenolic resins is a thermosetting polymer. Phenolic resin is notable for being a type of thermoset polymer, meaning that it cures into an altered form than when it is uncured; however, unlike other varieties of plastic polymers, it cannot be re-melted and re-molded.

From momentum conservation

Now, K.E is conserved in an elastic collision,

The Quaternary period is the most recent period in the geological time scale, and it is divided into two epochs: the Holocene and the Pleistocene. The Holocene epoch represents the current geological time period, which began approximately 11,700 years ago and continues to the present. The Pleistocene epoch preceded the Holocene and lasted from about 2.6 million years ago to approximately 11,700 years ago.

The fact that 'good absorbers of heat are good emitters' is based on Kirchoff's radiation law.

The Kirchoff's radiation law states that at a given temperature the coefficient of absorption of a body is equal to its coefficient of emission.

DDT is not a polymer. It is the product of two reactants and no further reactions occur. It is formed by the aromatic electrophilic substitution reaction. Chlorobenzene and chloral react in the presence of acidic medium and form DDT. It is used as insecticide.

Where, Tension

Frequency

Beat frequency

The most important safety method used for protecting home appliances from short-circuiting or overloading is use of fuse.

A fuse is a short length of wire designed to melt and break the circuit in the situation of overloading. Fuse comes with different permissible limits of current. Fuse is generally placed in series with the device so that in case of a short circuit or excess amount of current start flowing in a circuit the fuse blows or melt. This will break the circuit and stop the flow of current through the main component and hence prevents damage to equipment.

When the source approaches the observer,

When the observer approaches the source,

The above diagram represents a body in projectile motion. Maximum height . Thus, according to above equation larger the initial inclination, the greater is the height reached.

Given:

Investment of Shubham = Rs. 2250

Time period of Shubham = 1 Year i.e. 12 Months

Investment of Rahul = Rs. 2500

Total Profit = Rs. 6050

Profit of Rahul = Rs. 2750

Profit of Shubham = 6050 – 2750 = Rs. 3300

Ratio of profit = 3300 : 2750

= 6 : 5

The Ratio of capital is equal to the ratio of profit. Then,

⇒ 2250 × 12 : 2500 × X = 6 : 5

⇒ 5(2250 × 12) = 6(2500 × X)

⇒ X = 9 months

∴ Rahul invested after 3 months.

As we know,

Be

(Atom release)

Neutron is a chargeless particle, so it does not get deflected by an electric or magnetic field.

Given:

Five friends A, B, C, D and E invested and every month respectively.

A, B, C, D and E invested for years, years, years, years and years respectively.

Formula:

Ratio of Profit = Ratios of product of Amount invested and time

Calculation:

Amount A invested

Amount B invested

Amount C invested

Amount D invested

Amount E invested

Ratio profits

Ratio of profits of A, B, C, D and E

As we know,

If a, b and c are three terms in GP then b² = ac and vice-versa

If three terms a, b, c are in HP, then b =  and vice-versa

When three terms are in AP, the middle one is called the arithmetic mean of the other two.

If a, b and c are three terms in AP then b =  and vice-versa

Given x, y, z are in G.P

y² = xz ....(1)

On multiply both sides by 9, we get

⇒ (3y)² = 9xz

Taking log on both sides, we get

⇒ 2In 3y = In 3x + In 3z

⇒ ln(3x), ln(3y), ln(3z) are in A.P

So, ln(3x), ln(3y), ln(3z) are in A.P

Statement 1 is correct.

Again taking eq(1)

y² = xz 

Taking log on both sides, we get

⇒ 2In y = In x + In z

On adding 2xyz on both the sides, we get

⇒ 2(xyz + In(y)) = (xyz + In(x)) + (xyz + In(z))

⇒ xyz + ln(x), xyz + ln(y), xyz + ln(z) are in A.P

 are in H.P

It means  xyz + ln(x), xyz + ln(y), xyz + ln(z) are not in HP.

Statement 2 is not correct.

When one joule of energy is consumed in one second, then the power used is said to be One watt.

The rate at which electrical energy is dissipated into other forms of energy is called electrical power i.e.

Where, Potential difference, Resistance and current.

If,   Joule and second, then watt

Thus,  The power of an electric circuit is said to be one watt orone ampere volt if one joule of energy is consumed in one second.

Given:

The fraction

LCM of the fractions

The LCM of the numerator of

The HCF of the denominators of

The LCM of

The required result will be .

Magnetic susceptibility is the degree to which a material can be magnetized in an external magnetic field. In terms of the susceptibility χ, a material is diamagnetic if χ is negative, paramagnetic if χ is positive and small, and ferromagnetic if χ is large and positive.

Given data: Current, ; Time minutes seconds

​Bohr’s model of a Hydrogen atom: Bohr proposed that atoms had a planetary model with electrons orbiting the nucleus of an atom in specific orbits with a fixed radius.

The radius of n^th orbit of an atom according to Bohr's model is given as:

Where is the atomic number and is the smallest allowed radius for the hydrogen atom also known as the Bohr's radius with a value m.

The atomic number of Li (Lithium)

The ground state represents

The Bohr's radius of ion is

When a little mercury is drained off, the position of center of mass of the ball falls ( with respect to fixed end) so that the effective length of pendulum increases hence T increases. At first, Bob is filled up. Now as mercury is drained, the CM of Bob will go down and from the formula , Time period will be increase as length is increasing.

Now when the Mercury is about to drain off, CM will again shift to center of sphere and thus time period will decrease.

In any chemical reaction, there is only a change in the number of electrons that occurs, the number of proton and neutron remains unchanged.

In the formation of cation, electrons are removed.

In the formation of anion, electrons are gained.

In any atom Atomic number (Z) = the number of protons.

Z = P

Atomic mass (A) = Number of Neutron + Number of proton.

A = N + P

In the formation of , two-electron removed.

Number of electron electron.

The number of proton .

Number of neutron .

So, the number of electrons, protons and neutrons in ion are respectively and .

Potential difference between A and B,

Potential difference between and ,

Potential difference between and ,

s 1 day's work

s 1 day's work

s 1 day's work

On adding all three,

s 1 day's work

s 1 day's work

Hence, the work will be completed in days.

Mass number

The mass number can be calculated as the total number of protons and the number of neutrons in an atom.

mass number = protons + neutrons

As per given in the above question we have - Mass number=12, proton=6 and neutrons=?

12 = 6 + Number of neutrons

Number of neutrons = 12 - 6

Number of neutrons = 6

According to the question,

Let the ratio of their quantities be .

Ajay : Bhaskar : Moon

So, the profit ratio will be

By applying Kirchhoff's Voltage Law, we get

-10 + 2i +6 = 0

⇒ 2i = 10 - 6

⇒ i = 2....(i)

Again by applying Kirchhoff's Voltage Law, we get

-6 +iR + 4 = 0

⇒ iR = 6 - 4

From equation (i), we get

⇒ R =

⇒ R = 1

are in

and are in A.P

So, a, b, c are in AP

Now, Let are in GP

From here we are unable to check the relation between a, b and c, So, Our assumption was wrong.

So, are not in GP.

Only option (A) is correct.

Concept:

There are three methods of heat transfer between the two systems. They are conduction, convection, and radiation.

• Conduction is a method of heat transfer in solids and heat transfer takes place without the movement of particles.
• Convection is a method of heat transfer in fluids (gases and liquids) and heat transfer takes place due to the movement of particles.
• Radiation is a method of heat transfer where heat is transferred from one place to another without affecting the medium of heat transfer.

Both are at the same temperature, the metal will feel colder than the wood because of the thermal conductivity of the metal, compared to the wood is more.

Metal extract more heat from your hand than wood in a given time. Therefore, you perceive the metal as being colder than the wood.

The polyacrylonitrile is a polymer of acrylonitrile. It is formed from addition reactions of acrylonitrile in the presence of peroxide as catalyst. The monomer is acrylonitrile. Thus, its commercial name is acrilan or orlon.

The phase is the angle made by the particle.

The smallest interval of time after which the motion is repeated is called a period.

The reciprocal of the smallest interval of time after which the motion is repeated is its frequency.