MP Police SI (Technical) Mock Test - 6 - MP Police SI MCQ

Since ,   can not be negative 

So,

Let the original speed of the car is km/hr. 

Then, time taken in moving km hr

If speed is going km/hr more  

Then, time taken in moving km hr

or

If is not true because the speed is not negetive.

So, speed is km/hr.

Heavy water has deuterium (D) which is an isotope of hydrogen.

While hydrogen has 1 proton and 0 neutrons in its nucleus giving it an atomic weight of 1, deuterium has 1 proton and 1 neutron in its nucleus. So, deuterium has atomic weight 2.

So, heavy water, which has the molecular formula D₂O, has molecular mass = 16(for oxygen) + (2 × 2)(for two deuteriums) = 20

Power of the bulb watt
Energy of one photon is
We know that,
Given
By putting the values, we get 
Number of photons emitted in 1 sec energy of one photon power

photons per sec

Extremely high temperatures are measured with an absolute radiative thermometer. The absolute irradiance thermometer is based on Stephen's law. According to this law, the energy (E) radiated by a black body is proportional to the fourth power of the absolute temperature (T), i.e.,

Where (s) is a constant.

For temperature measurement, the radiation of a hyperthermal object from a lens or mirror is focused on one end of the pair of temperature differences, it generates energy. If the constant is known, then the temperature can be calculated by the above equation.

From the above figure, is tangent to the smaller circle at point P.

By Pythagoras theorem, in triangle OPA

Now, as ,

Since the perpendicular from the center of the circle bisects the chord, AP will be equal to PB

So,

Thermocouple is based on the principle of Seebeck effect. According to the Seebeck effect, an EMF is generated in a circuit containing two dissimilar metals when the two junctions are maintained at different temperatures. A thermocouple is a temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots.

Given:

Average of numbers

Average of first numbers

Average of last numbers

As we know,

Average

Average of numbers

Sum of numbers

Similarly, sum of first numbers

Sum of last numbers

number will be Sum of first numbers Sum of last numbers Sum of numbers

Now,

Average of remaining numbers

or

The required result is .

Given:

The difference between the two different numbers is .

The smallest fraction is .

Let the larger number be

Now,

So, the larger fraction

∴ is the larger fraction.

Given:

Number

Average

Average

The value of is .

Propane is an example of clean fuel.

• Propane is similar to Liquified Petroleum Gas, but the latter has some other traces of gases like Butane, Isobutane, and natural gas liquids.
• Coke releases a lot of unburnt particles.
• Petrol and Wax are not clean fuel as they release a lot of harmful gases including SOx and NOx.

Given:

14.28% of 630 + 32% of ? = 202

⇒  × 630 +  × ? = 202

⇒ 90 +  × ? = 202

⇒  × ? = 112

⇒ ? = 112 × 

⇒ ? = 350

∴ 350 should come in place of the question mark (?).

Given,

When 10 persons shake hands with one another.

Let the N be a number of people

Use this formula in such types of problems

The total number of Handshakes are

Given:

Average weight of number of students in a group

12 students weight joined the group, the weight fall the students in the group decreases by

Formula Used:

Average = Sum of observation/Number of observation

Calculation:

Let the number of students initially

Sum = Average Number of students

Total intial weight

Weight of new students

The new average

New average

There is 20 students initially

Foam and powder type of fire extinguisher is used to extinguish petroleum fires.

There are 5 main fire extinguisher types – CO₂, Water, Dry Powder, Foam, and Wet Chemical (Soda-Acid).

In the word “PARAGLIDING”, there are 11 letters in which there are 4 vowels (i.e., 2 A and 2 I) and 7 consonants (i.e., 2 G and each of P, R, L, D, N).

Considering vowel as one letter, the number of letters becomes 8 which can be arranged as,

Total vowel

Vowel A and I appear twice, so vowels can be arranged as,

Hence the required number of ways in which the letters of the word "PARAGLADING" be arranged so that all the vowels occur together

As we know,

Initial kinetic energy

Since the velocity is three times, the final velocity

Final kinetic energy

The change in kinectic energy

So, from the above points, we can clearly infer that the change in the kinetic energy of the object is .

Basic Principle of Counting:

If there are m ways for happening of an event A, and corresponding to each possibility there are n ways for happening of event B, then the total number of different possibilities for happening of events A and B are:

• Either event A alone OR event B alone = m + n.
• Both event A AND event B together = m × n.
  

Since, the repetition is not allowed, we cannot form a four-digit or a higher digit number.

We have the following possible cases:

One-digit number:

There are three possibilities for the single digit. possibilities

Two-digit number:

There are three possibilities for one of the digits, and corresponding to each possibility, the other digit will have two possibilities. possibilities.

Three-digit number:

There are three possibilities for one of the digits, and then two possibilities for the second digit and then only a single possibility for the third digit. possibilities.

The total number of possible numbers .

Given:

Each atom of copper contributes 1 free electron Density of copper

Diameter of copper wire

Current flowing from the wire

Number of atoms of copper will be

We know that density is equals to mass per unit volume. So

Volume

So will be

Area

We know that drift velocity , where is current, is area.

By substituting the values we get-

Given,

The departure time of the train is on th June .

Now, let's count the time duration,

On th June , till hours

On st July , till hours

On nd July , till hours and minutes

So, the total travel time from Bengaluru to Guwahati is hours minutes hours and minutes.

The subtraction of the fraction from can be written as .

LCM of and is .

Combination is the number of ways in which we can select a group of objects from a set.

For example, selecting things from a set of things is given as .

We have to select 11 players from a total of 15 players.

So, the number of ways

Given,

Average of 6 numbers is 20.

Average

Total

added to each numbers

120 + (5 × 6)

New average

Water is not a mixture but a compound. Water has 2 parts of Hydrogen and 1 part of Oxygen which are combined chemically. This is why water is a compound.

Air, soil, and chalk are mixtures. In these, there are more than two substances and are not combined chemically. This is the reason that all of them are mixtures.

The device used for producing electric current is called an electric generator, whereas an electric motor uses electric current to do mechanical work.

A galvanometer detects the presence of current in the circuit and an ammeter is used to measure the current in the circuit.

A particular player should not be included

We have to select 5 players from players

So, required number of ways

Here, we first have to select 9 students from 17 students.

Tip:

SELECT Combination

SELECT and ARRANGE Permutation

Arrange students in circle ways students remain.

Arrange remaining students in another circle ways

Total ways to arrange students in circles

The specific resistance of a rod of copper as compared to that of thin wire of copper is same.

Specific resistance of a conductor depends on the nature of material but is independent of the dimension of the conductor. Thus specific resistance of rod of copper as compared to that of thin wire of copper is same.

Thermoelectric power is the rate of change of thermoelectric emf with temperature. It is also called Seebeck coefficient and is denoted by S.

We have,

Thermoelectric power is,

So,

Comparing it with the equation,

Above is straight line equation.

Thus, the graph between thermoelectric power and temperature is plotted below: