Question: The number of significant figures in the length of a bar 6200mm measured by meter rod is_______________?

• 1. 4
• 2. 3
• 3. 2
• 4. None of these

Question: The number 76.85 is rounded off up to two significant figures as_____________?

• 1. 76.8
• 2. 77
• 3. 76.9
• 4. None of these

Question: Which of the following is not a correct representation method for prefixes______________?

• 1. 1mm
• 2. 10km
• 3. 1000um
• 4. Both A and B

Question: Which of the following are not deflected by electric and magnetic fields ?

• 1. Alpha rays
• 2. Beta rays
• 3. Gamma rays
• 4. None of these

Question: Why the needle of iron swims on water surface when it is kept gently ?

• 1. It will remain under the water, when it will displace more water than its weight
• 2. the density of needle is less than that of water
• 3. due to surface tension
• 4. due to its shape

Question: Rain drops fall from great height Which among the following statements is true regarding it?

• 1. they fall with that ultimate velocity, which are different for different droplets
• 2. they fall with same ultimate velocity
• 3. their velocity increases and they fall with different velocity on the earth
• 4. their velocity increases and they fall with same velocity on the earth

Question: Which of the following statements is true when we see ‘rainbow’ ?

• 1. We face sun and raindrops
• 2. The Sun remains behind us and we face raindrops
• 3. In light rainfall, we face Sun
• 4. The sky remains clear and the sun is at lower position in the sky

Question: The audio signals of TV are _____________?

• 1. Amplitude modulated
• 2. Frequency modulated
• 3. fixe modulated
• 4. Velocity modulated

Question: The owl can see most clearly in total darkness because:

• 1. it has squint eyes
• 2. it has light bulbs in its eyes provided by nature
• 3. it produces infrasonic sounds
• 4. it has large eyes with orbs directed forward, giving it binocular sight

Question: A photostat machine works on _____________?

• 1. electromagnetic image making
• 2. magnetic image making
• 3. thermal image making
• 4. electrostatic image making