NDA CHEMISTRY SECTIONAL TEST - 1

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Question 1:

A sealed tube that can withstand a pressure of 3 atm is filled with air at 27°C and 760 mm pressure. Find the temperature above which it will burst?

Question 2:

Which of the following statement is true ?

Question 3:

Which of the following law is governed by this graph?

Question 4:

A brown layer formed when an iron article is left exposed in an open area is called ………………….

Question 5:

Combined gas law is obtained by combining-

Question 6:

DIRECTIONS: Read the following two statements and choose the correct answer. 

Statement -1 Potassium chloride and ammonium chloride is separated by the method of sublimation .

Statement – 2 sublimation is used when one of the component of a mixture is decomposed below its boiling point .

Question 7:

The question consists of two statements– Assertion (A) and Reason (R). Answer the question selecting the appropriate option given below:
Assertion-  50 grams of substance A in a glass will become liquid when allowed to melt to give 50 grams of substance A in liquid form.

Reason-  Law of conservation of mass is that mass can neither be created nor be destroyed.

Question 8:

A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water . The filter paper was removed when the water moved near the top of the filter paper. Based on this information , which of the following statement is not correct ?

Question 9:

Chromatography is used to separate colour components of dye .It is a physical method that is used to separate__________

Question 10:

DIRECTIONS: Read the following two statements and choose the correct answer. 

Statement 1 – Chalk dissolved in water form a suspension .This is a chemical change .

Statement 2 – A change in which chemical composition change is known as Physical change .

Question 11:

Following are the properties of sample A

  1. Have high melting point
  2. Electrostatic force of attraction is present between the constituent particles

Sample A is 

Question 12:

The temperature at the foot of a mountain is 30°C and pressure is 760 mm. Whereas at the top of the mountain these are 0°C and 710 mm. The densities of the air at the foot and at the top is

Question 13:

Which of the following is the crystalline solid?

  1. Polyurethane
  2. Copper
  3. Benzoic acid
  4. Teflon
  5. Potassium nitrate

Question 14:

DIRECTIONS: Read the following two statements and choose the correct answer. 

Statement 1 – Silica is a compound .

Statement 2 – Silica has a definite melting point .

Question 15:

Liquid ammonia bottle is cooled before opening the seal because-

Question 16:

Suggest separation technique one would need to employ to separate the following mixtures mercury and water?

Question 17:

Fluorescent lamps are a lamp type that is commonly used to provide illumination for settings such as commercial lighting, industrial lighting, classroom lighting, and retail lighting. They glow due to the presence of_________.

Question 18:

The tyre of an automobile is inflated at lesser pressure in summer than in winter because 

Question 19:

In a hospital, an oxygen cylinder holds 10 L of oxygen at 200 atm pressure. If a patient breathes in 0.50 ml of oxygen at 1.0 atm with each breath, for how many breaths the cylinder will be sufficient. Assume that all the data is at 37°C.

Question 20:

Which of the following is correct for Charles Law ?

  1. V/T = constant 
  2. V T
  3. V 1/T
  4. P T