MP Police SI (Technical) Mock Test - 9 - MP Police SI MCQ

Given:

Gain

Discount

Decrease in cost price

As we know:

Selling price Marked price Discount

Selling price Cost price profit

Let cost price of article be Rs. .

Selling price Rs.

Marked price Rs.

New cost price Rs.

New selling price Rs.

Let discount percentage given be .

So,

He should give discount on decreased cost price.

• Nitrogen shows covalency of 4 by coordinate bonding when it donates ns-electron pair to Lewis acid. So, statement 2 is correct.
  
• Nitrogen exhibits the oxidation state ranging from -3 in ammonia and +5 in Nitric Acid. So, statement 1 is incorrect.
• Since Nitrogen has no d-orbitals, it cannot undergo sp³ hybridization. So, statement 3 is incorrect.
• Nitrogen forms oxides within the range to +5. So, statement 4 is incorrect.

Given:

Cost of per articles = Rs. 5

Profit

Profit percent

CP = cost price

selling price

CP of 600 articles Rs.

Rs. 3000

SP of 500 articles Rs.

Rs. 3900

SP per articles Rs.

Rs.

SP of 540 articles Rs.

Rs. 4212

Profit Rs. Rs. 1212

Profit percent

Profit percent is

Given:

and

Concept used:

Calculation:

Putting values in , we get

Total mass of reactants = Tomorrow mass of products

So, the given data supports the law of impermanence of matter.

Given:

Marked Price, X = Rs. 25,000

Rate, r₁ = 15%

Rate, r₂ = r%

Selling Price = Rs. 17,000

Selling Price =

⇒ 17,000 =

⇒ 17,000 =

⇒ =

⇒ =

⇒ =

⇒ 20% = r

∴ The value of r is 20%.

Roasting is the process of heating a sulfide ore to a high temperature in presence of air. It is a step in the processing of certain ores. More specifically, roasting is a metallurgical process involving gas-solid reactions at elevated temperatures with the goal of purifying the metal component(s). Often before roasting, the ore has already been partially purified, e.g. by froth flotation. The concentrate is mixed with other materials to facilitate the process. The technology is useful but is also a serious source of air pollution.

Roasting consists of thermal gas-solid reactions, which can include oxidation, reduction, chlorination, sulfation, and pyrohydrolysis. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulfide minerals. During roasting, the sulfide is converted to an oxide, and sulfur is released as sulfur dioxide, a gas. For the ores (chalcocite) and (sphalerite), balanced equations for the roasting are:

Aluminum is the most abundant metals are 8.1% of aluminum, 5.0% of iron, and 3.6% of calcium, in the Earth’s crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% of the weight of the Earth’s solid surface. Earth’s crust occupies less than 1% of Earth’s volume. Next comes calcium which is 3.6 % followed by Sodium, Potassium, Magnesium, and others.

Given,

The percentage error in the measurement of mass,

The percentage error in the measurement of speed,

The kinetic energy of the particle is given by

The percentage error in kinetic energy will be,

Phosphorus triiodide is an unstable red solid which reacts violently with water. It is a common misconception that is too unstable to be stored; it is, in fact, commercially available. It is widely used in organic chemistry for converting alcohols to alkyl iodides.

It is given that, m and n (m < n) be the roots of the equation x² - 16x + 39 = 0

⇒ x² - 13x - 3x + 39 = 0

⇒ x (x - 13) - 3 (x - 13) = (x - 13) × (x - 3) = 0

⇒ x = 13 or 3

⇒ m = 3 and n = 13

∵ m, p, q, r, s and n are in AP

⇒ p + q + r + s = (m + d) + (m + 2d) + (m + 3d) + (m + 4d)

= 4m + 10d

= 2 × (2m + 5d)

= 2 × [m + (m + 5d)]

= 2 × (m + n)          ∵ (n = m + 5d)

⇒ p + q + r + s = 2 × (m + n) = 32      ∵ m + n = 16

Given,

A number is first decreased by

The new number

And then increased by

The number becomes

Given,

The value of original number is .

Given:

Akash and Babul started a business by investing their amount in the ratio of 2 : 3

Concept Used:

In partnership, business profit is distributed as their investment ratio

Let, the investment of Akash and Babul are 2x and 3x

According to the question,

⇒ 3x = 2400

⇒ x = 800

∴ The profit amount get by Akash is 2x = 2 × 800

⇒ Rs. 1600

∴ The profit amount get by Akash at the end of the year is Rs. 1600

and invested in a business. The profit earned was divided in the ratio .

Amount invested to ratio of their profit

The amount of invested Rs. 40000 and amount invested by is .

Amount invested to ratio of their profit

The amount invested by is Rs.

is produced during calcination. It involves heating when the volatile matter escapes leaving behind the metal oxide.

We can use this formula to solve this question

We have to find

is the required answer.

To balance a chemical reaction:

Check the number of atoms before and after the reaction.

Balance the elements one at a time by adding coefficients before them.

Change the coefficients as required.

Never change the subscripts.

is the balanced equation.

• The balance of the above equation requires moles of .

A person suffering from Shortsightedness can see near objects, but cannot see distant objects. A concave lens is used to correct shortsightedness.

Given watt

When the resistors are connected in series the equivalent resistance is given as,

....(1)

So heat dissipated when the resistors are connected in series is given as,

...........(2)

When the resistors are connected parallel the equivalent resistance is given as,

.................(3)

So heat dissipated when the resistors are connected in series is given as,

.................(4)

By equation 2 and equation 4,

In the case of electrolytic refining of nickel, crude nickel is taken as Anode.

Electrolytic refining is the process of refining of metal in which impure metal is made the anode and a thin strip of pure metal is made the cathode. A solution of the metal salt is used as an electrolyte. Eg: used as electrolyte.

I.

II.

So, 

 does not represent electric power in a circuit.

Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit.

In simple harmonic motion,

Velocity

Acceleration

From this, we can easily see that when is maximum, is zero.

It is given that,

n (A) = 3 and n (B) = 6

As we know that, if A and B are two sets then, n (A ∪ B) = n (A) + n (B) - n (A ∩ B)

⇒ n (A ∪ B) = 3 + 6 - n (A ∩ B)

In order to minimize n (A ∪ B) we have to maximize n (A ∩ B).

If A is a subset of B, then A ∩ B = A

⇒ n (A ∩ B) = n (A) = 3

⇒ n (A ∪ B) = 3 + 6 - 3 = 6

Hence, the minimum number of elements that (A∪B) can have is 6.

Copper oxide combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.

The natural gas flame color blue indicates the complete combustion, burns at a temperature of around 1960^oC.

The natural gas flame occurs orange/yellow/red in color when there is incomplete combustion.

Ethyl acetate, Acetamide and Acetonitrile will react with hrdroxyl ions by nucleophilic attack but Diethyl ether will not react with hrdroxyl ions by nucleophilic attack.

Control pupil size is the function of an important part of the human eye, the iris. It controls how much light enters the eye by changing the size of the pupil.

Eye colour is defined by the iris. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm.

Steel - Iron with about carbon and may contain some other elements like manganese.

Bronze - It consists of copper, tin, and with the addition of some other metals like aluminum, manganese, zinc or nickel in small proportions.

Brass - Copper and zinc with some other elements like arsenic, lead, phosphorus, aluminum, manganese, and silicon.

Given,

As we know that is a constant value and will have no dimension.

Thus, the dimension of will be equal to the dimension of .

Dimension of position,

The dimension of velocity,