Question

The image of an object formed by your eye lens on the retina is

1 point

erect and real

inverted and real

erect and virtual

inverted and virtual

 

This is a required question

2 *

Image formed by plane mirror is

1 point

Real and erect

Real and inverted

Virtual and erect

Virtual and inverted

3 *

Power of the lens is -40, its focal length is

1 point

4m

-40m

-0.25m

-25m

4 *

The radius of curvature of a mirror is 20cm the focal length is

1 point

20cm

10cm

40cm

5cm

5 *

Electrical resistivity of a given metallic wire depends upon

1 point

its length

its thickness

its shape

nature of the material

6 *

Unit of electric power may also be expressed as

1 point

volt ampere

kilowatt hour

wattsecond

joule second

7 *

Which of the following is not a physical change?

1 point

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

Combustion of Liquefied Petroleum Gas (LPG)

8 *

1 point



(i), (ii) and (iii)

(iii) and (iv)

(i), (ii) and (iv)

(ii) and (iv)

9 *

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are)Correct?(i) In beakers A and B, exothermic process has occurred.(ii) In beakers A and B, endothermic process has occurred.(iii) In beaker C exothermic process has occurred.(iv) In beaker C endothermic process has occurred.

1 point

(i) only

(ii) only

(i) and (iv)

(ii) and (iii)

10 *

Which of the following statements is true for acids?

1 point

Bitter and change red litmus to blue

Sour and change red litmus to blue

Sour and change blue litmus to red

Bitter and change blue litmus to red

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Answer 1

Answer:

erect and real

real and inverted

-0.25m

10cm

its thickness

kilowatt hour

Boiling of water to give water vapour

(iii) and (iv)

2 only

Bitter and change red litmus to blue