### Class X

One lady is wearing high heels and other one is wearing flat shoes. Shoes going to get stuck in mud are
1. The high heels
2. The flat shoes
3. Both of them
4. None of them
Speed of a microwave of wavelength 5 × 10-3 m in a vacuum is 5 × 108 m s-1, its frequency is equal to
1. 1.5 × 105 m s-1
2. 6 × 109 m s-1
3. 1.5 × 106 m s-1
4. 6 × 1010 m s-1
In a science lab, a student uses 150g of water and heats it from 10 °C to 30 °C with energy of 10000 J, heat capacity of water is
1. 250 J K-1
2. −250 J K-1
3. 500 J K-1
4. −500 J K-1
In an aquarium, air bubble at bottom has a volume = 0.5 mm³. What would be size of bubble at top if height of water level is = 1 m. (density of water = 1000 kg ⁄ m³, atmospheric pressure = 1 × 105 Pa, gravitational acceleration = 10 m s-1²)
1. 0.5 mm³
2. 0.55 mm³
3. 0.6 mm³
4. 0.65 mm³
Transfer of heat energy is because of
1. Good conductivity of a metal
2. Bad conductivity of a metal
3. Atomic or molecular vibration
4. Neutronic activation
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