NDA MOCKTEST 2019 (2) 51-75

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1. A thin disc and a thin ring, both have mass M and radius R. Both rotate about axes through their center of mass and are perpendicular to their surfaces at the same angular velocity. Which of the following is true ?

1 point

(a) The ring has higher kinetic energy

(b) The disc has higher kinetic energy

(d) Kinetic energies of both the bodies are zero since they are not in linear motion

Clear selection

2. Let there be an object having some chemicals in it. It starts moving with a uniform velocity v and a chemical reaction starts happening. In this case, which of the following statement/s is/are correct?1. Chemical reactions happening in the system cannot change the velocity v of the center of mass of the object.2. Chemical reactions happening in the system cannot change kinetic energy of the particles inside with respect to the center of mass of object.Select the correct answer using the code given below :

1 point

(a) 1 only

(b) 2 only

(d) Neither 1 nor 2

Clear selection

3. In which of the following phenomena do heat waves travel along a straight line with the speed of light?

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(a) Thermal conduction

(b) Thermal convection

(d) Both, thermal conduction and radiation

Clear selection

4. Which one of the following statements regarding Ohm's law is not correct?

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(a) Ohm's law is an assumption that current through a conductor is always directly proportional to the potential difference applied to it.

(b) A conducting device obeys Ohm's law when the resistance of a device is independent of magnitude and polarity of applied potential difference.

(c) A conducting material obeys Ohm's law when the resistance of material is independent of the magnitude and direction of applied electric field.

(d) All homogeneous materials obey Ohm's law irrespective of whether the field is within range or strong

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5. When a ball bounces off the ground, which of the following changes suddenly ? (Assume no loss of energy to the floor)

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(a) Its speed

(b) Its momentum

(d) Its potential energy

Clear selection

6. Which one of the following compounds does not exhibit a different oxidation number of the same element ?

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(a) Pb304

(b) Fe3O4

(d) Mn3O4

Clear selection

7. Which one of the following statements about glass is not correct?

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(a) Glass is often said to be a supercooled liquid.

(b) Glass has no definite melting point.

(d) Boron is present in pyrex glass.

Clear selection

8. Which one of the following statements is correct?

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(a) Both boiling and evaporation are surface phenomena.

(b) Boiling is a surface phenomenon, but evaporation is a.

(d) Boiling is a bulk phenomenon, but evaporation is a surface phenomenon.

Clear selection

9. Which one of the following statements about diamond and graphite is not correct ?

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(a) Diamond has a tetrahedral structure, whereas graphite has a hexagonal planar structure.

(b) Both physical and chemical properties of diamond and graphite are different.

(d) Graphite is a good conductor of electricity while diamond is not.

Clear selection

10. The raw materials used for the manufacture of Portland cement are

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(a) Lime, silica and sulphur dioxide

b)Lime, silica and carbon dioxide

d) Lime, silica and boric acid

Clear selection

11. Which one of the following statements about water is not true?

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(a) Hydrogen bonds are present in liquid water.

(b) Water has a high boiling point.

(d) Water is a non-polar molecule

Clear selection

12. A sample of 'soft soap' contains

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(a) Caesium

(b) Potassium

(d) Magnesium

Clear selection

13. If an object moves at a non-zero constant acceleration for a certain interval of time, then the distance it covers in that time

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(a) depends on its initial velocity.

(b) is independent of its initial velocity.

(d) depends on its initial displacement.

Clear selection

14. A solid disc and a solid sphere have the same mass and same radius. Which one has the higher moment of inertia about its centre of mass?

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(a) The disc

(b) The sphere

(d) The information provided sufficient to answer the question

Clear selection

15. Two substances of densities e, and P2 are mixed in equal volume and their relative density is 4. When they are mixed in equal masses, relative density is 3. The values of P1 and p, respectively are

1 point

(a) 6,2

(b) 3,5

(d) 9,3

Clear selection

16. A car starts from Bengaluru, goes 50 km in a straight line towards south, immediately turns around and returns to Bengaluru. The time taken for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip

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(a) is 0.

(b) is 50 km/hr.

(d) cannot be calculated without knowing acceleration

Clear selection

17. “The sum of emfs and potential differences around a closed loop equals zero" is a consequence of

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(a) Ohm's law.

(b) Conservation of charge.

(d) Conservation of energy.

Clear selection

18. A student measures certain lengths using a meter scale having least count equal to 1 mm. Which one of the following measurements is more precise ?

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(a) 0-50 mm

(b) 29.07 cm

(d) 910 mm

Clear selection

19. If the work done on the system or by the system is zero, which one of the following statements for a gas kept at a certain temperature is correct?

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(a) Change in internal energy of the system is equal to flow of heat in or out of the system.

(b) Change in internal energy of the system is less than heat transferred.

(d) cannot be determined.

Clear selection

20. Consider the following part of an electric circuit :The total electrical resistance in the given part of the electric circuit is

1 point

(a) 15/8 ohm

(b) 15/7 ohm

(d) 17/3 ohm

Clear selection

21. Which one of the following statements regarding lenses is not correct?

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(a) A convex lens produces both real and virtual images.

(b) A concave lens produces both real and virtual images.

(d) A concave lens always produces images smaller than the size of the object

Clear selection

22. 10 g of ice at - 10°C is mixed with 10 g of water at 0°C. The amount of heat required to raise the temperature of mixture to 10°C is

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(a) 400 cal

(b) 550 cal

(d) 1200 cal

Clear selection

23. Which one of the following does not represent the salt, Calcium carbonate ?

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(a) Lime water

(b) Limestone

(d) Marble

Clear selection

24. Soaps clean surfaces on the principle based on

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(a) Viscosity

(b) Floatation

(d) Surface tension

Clear selection

25. Which one of the following substances is not a mixture?

1 point

(a) Tin

(b) Sea water

(d) Air

Clear selection

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