Physics for Defence Warriors set 2 ( NDA / CDS / AFCAT )

• 0 Questions answered correctly
• 0 Questions answered incorrect
• 15 Questions unattempted

• 1

  1. Ampere is the unit of

   

  • A

    A.voltage

     

  • B

    B.electric current

     

  • C

    C.resistance

     

  • D

    D.power

  Explanation

  Ampere is the unit of electric current.

• 2

  2. Match List I with List II and select the correct answer from the codes given below.

  List II (Physical quantities)	List II (Units)
  A. Acceleration	1. Joule
  B. Force	2. Newton-second
  C. Work done	3. Newton
  D. Impulse	4. Metre/second

   

  Codes

  • A

    A1

    B2

    C3

    D4

  • B

    A3

    B4

    C1

    D2

  • C

    A2

    B3

    C4

    D1

  • D

    A4

    B3

    C1

    D2

  Explanation

  The correct matching is A-4, B-3, C-1, D-2.
  Unit of acceleration is metre/second .
  Unit of force is newton.
  Unit of work done is joule.
  Unit of impulse is newton-second.

• 3

  3. What is measured in cusec?

   

  • A

    A.Purity of water

     

  • B

    B.Depth of water

     

  • C

    C.Flow of water

     

  • D

    D.Quantity of water

  Explanation

  Flow of water is measured in cusec. Generally, this unit of flow of water is used by irrigation department.
  1 cusec is one cubic foot of water flow per second.

• 4

  4. If the number representing volume and surface area of a cube are equal, then the length of the edge of the cube in terms of the unit of measurement will be

  • A

    A.3

     

  • B

    B.4

     

  • C

    C.5

     

  • D

    D.6

  Explanation

  If ' ' be the side of cube, then Volume of cube,
  Surface area of cube,
  According to given condition,

  

• 5

  5. Which one of the following is not the unit of heat?

   

  • A

    A.Centigrade

     

  • B

    B.Calorie

     

  • C

    C.Erg

     

  • D

    D.Joule

  Explanation

  Centigrade is not the unit of heat. It is a scale and unit of measurement for temperature. It measures the degree of hotness or coldness.

• 6

  6. Which one of the following is not the unit of heat?

   

  • A

    A.Calorie

     

  • B

    B.Kilocalorie

     

  • C

    C.Kilojoule

     

  • D

    D.Watt

  Explanation

  Explanation: Watt is not the unit of heat, it is the unit of power.
  On the other hand, calorie and kilocalorie are CGS units of heat energy whereas, kilojoule (or joule) is its SI unit. Also, 1 calorie is equal to 4.2 joule and 1 kJ is equal to .

• 7

  7. A unit of van der Waals' constant ' ' is

   

  • A

    A.

  • B

    B.

  • C

    C.

  • D

    D.

  Explanation

  

• 8

  8. Current density is

   

  • A

    A.a scalar quantity

     

  • B

    B.a vector quantity

     

  • C

    C.dimensionless

     

  • D

    D.None of these

  Explanation

  Current density is a vector quantity.
  The current density at a point in a conductor is the ratio of the current in the conductor to the area of cross-section of the conductor at that point.
  The SI unit of current density is ampere/metre .

• 9

  Match the following.

  	List I		List II
  A.	Joule	1.	Current
  B.	Ampere	2.	Power
  C.	Watt	3.	Work
  D.	Volt	4.	Electric potential

   

  Codes

  • A

    A3

    B1

    C2

    D4

  • B

    A1

    B2

    C3

    D4

  • C

    A4

    B3

    C2

    D1

  • D

    A1

    B3

    C2

    D4

  Explanation

  The correct matching is A-3, B-1, C-2, D-4. Joule ( ) is the SI unit of work. Ampere is the SI unit of current. Watt (W) is the SI unit of power. Volt (V) is the SI unit of electric potential.

• 10

  10. A distance of means

   

  • A

    A.100 m

     

  • B

    B.1000 cm

     

  • C

    C.1000 m

     

  • D

    D.100 cm

  Explanation

  A distance of 1 km means 1000 m .
  i.e.,

• 11

  11.1 micron is equal to

   

  • A

    A.

     

  • B

    B.

     

  • C

    C.

     

  • D

    D.

  Explanation

  

• 12

  

  • A

    A

  • B

    B

  • C

    C

  • D

    D

  Explanation

  1 picogram is equal to . It is one trillionth of a gram.
  The suffix of pico represents multiplier of .

• 13

  

  • A

    A

  • B

    B

  • C

    C

  • D

    D

  Explanation

  

• 14

  14. The smallest unit of length is

   

  • A

    A.micron

     

  • B

    B.nanometre

     

  • C

    C.angstrom

     

  • D

    D.fermimetre

  Explanation

  

• 15

  The prefix for the multiple of is

   

   

  • A

    A.tera

     

  • B

    B.peta 

     

  • C

    C.exa

     

  • D

    D.atto

  Explanation