Subject: Science                                        Marks: 10
Grade: 07                                                                                                              Time:  20 Minutes 
Name: _________________________                       
Section “A”
Question No.1: Encircle the appropriate option for the given items.
1. Objects that vibrate slowly have a pitch.
             A. High B. Loud C. Soft D. Low
2. Sound waves travel fast through;
             A. Solids   B. gases C. air       D. liquids
3. A sound wave is a;
             A. Transverse wave B. Longitudinal wave     C. Standing wave  D. none of these
4. Electric current is the
             A. Flow of atoms     B. Flow of protons  C. Flow of electrons   D. Flow of neutrons
5. Which one is an insulator?
             A. Copper B. Glass C. Iron D. Aluminum
6. The device to measure potential difference in a circuit is called;
             A. Ammeter B. Voltmeter C. Barometer D. Thermometer
7. Distances among the stars are usually measured in;
             A. Meters B. Kilometers C. Light years D. yards
8. Our neighboring galaxy is named as;
             A. Cepheus B. Andromeda C. Canis Major   D. Taurus
9. The splitting of white light into its component colours is called;
             A. Dispersion of light   B. Reflection of light       C. Total internal reflection     D. Mirage
10. We see a mirage due to the;
             A. Reflection of light   B. Total internal reflection    C. Dispersion of light   D. Refraction of light
Section “B” and “C”
Marks: 30                                             Time:  85 Mins
                                                                                                                     
Question No. 2: Answer any five parts of the following. (5×2=10)
⦁ What is refractive index?
⦁ Name any four devices we use in our daily life which produce different sounds.
⦁ What makes some sounds loader than others?
⦁ Define electric current.
⦁ Which galaxy, the sun belongs to?
⦁ What is meant by critical angle?
⦁ Differentiate between reflection and refraction of light.
Attempt any four questions from the following. (4×5= 20)
Question No. 3: What is dispersion of light? Why does light get dispersed?
Question No. 4: Describe loudness and pitch of the sounds with the help of examples.
Question No. 5: Explain series and parallel circuits in detail. Also draw diagrams.
Question No. 6: How do constellations differ from galaxies?
Question No. Compare and contrast between transverse waves and longitudinal waves.