Class 7 physics MCQ questions for half yearly exam 2023 2024

 1. Select the correct alternative:

1.1 in the process of radiation, heat travels:

A. Sideways

B. Downwards

C. Upwards

D. In all directions

1.2 the temperature of pure melting ice:

A.100°C

B.273K

C. 212°F

D. None of these.

1.3 if we add a lump of ice to a tumbler containing water:

A. Heat flows from Ice to water if ice is more.

B. Heat flows from water to ice.

C. Heat flows from Ice to water.

D. Heat flows from water to ice if water is more.

1.4 which statement is incorrect:

A. On touching a lump of ice, we feel cold because some heat passes from our body to the ice.

B. Land and sea bridges are Convection currents of cold and warm air.

C. Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.

D. Medium is necessary for the transfer of heat by radiation.

1.5 a thermometer uses:

A. Water

B. Krosene

C.air

D. None of these.

1.6 which is the fastest mode of transfer of heat:

A. Conduction

B. Convection

C. Radiation

D. None of these

1.7 the speed of light in vacuum

A.3 ×10⁷cm/s

B. 3×10⁸cm/s

C. 3 × 10⁹cm/s

D. 3× 10¹⁰ cm/s

1.8 the temperature rises by by 18 degree fahrenheit. What is the rise on the Celsius?

A. 7.77°C

B.10 °C

C. 14.44°C

D.  28 °C

1.9 the speed of light is minimum in

A. Glass

B. Water

C.air

D.kerosene.

1.10 the angle of incidence on a plane mirror is 75°. The angle formed between incident ray and reflected ray will be:

A.37.5°

B.75°

C.0°

D. None of these.

1.11 a man standing in front of a plane mirror find his image to be at a distance of 12 m from himself. The distance of man from the image is:

A. 6m

B.12m

C.18m

D.24m

1.12 convert the temperature of water at 30° C to degree fahrenheit

A.56°F

B.66°F

C.76°F

D.86°F

1.13 the angle between the incident ray and the ray reflected from the plane mirror is 70 degree. The angle of incidence will be:

A.15°

B.30°

C.60°

D. None of these.

1.14 A green leaf is seen in green  light. It will appear

A. Red

B.black

C.bright green

D.yellow

1.15 a ray of light after reflection from a mirror forms 

A. Angle of incidence

B. Angle of reflection

C. Glance angle

D. None of these.