Oswaal ICSE _ 10 SQP-3

The correct relationship between the SI unit (Newton-meter) and the CGS unit (dyne-centimeter) of moment of force is:

• 1 Nm = 10⁵ dyne cm

• 1 Nm = 10⁷ dyne cm

• 1 Nm = 10⁵ dyne

• 1 Nm = 10⁷ dyne

For maximum work to be done by a force, the angle between the force and the displacement should be:

• 0 degrees

• 45 degrees

• 90 degrees

• 180 degrees

As a simple pendulum swings from its mean position to its extreme position, the energy transformation is:

• Kinetic energy to kinetic energy

• Potential energy to potential energy

• Kinetic energy to potential energy

• Potential energy to kinetic energy

If two pulley systems are used to lift the same load, one with a single fixed pulley and the other with a movable pulley, the force required to lift the load with the movable pulley will be (assuming ideal conditions):

• The same as with the fixed pulley

• Half of that with the fixed pulley

• Double that with the fixed pulley

• Four times that with the fixed pulley

In water, which color of light has the *lowest* speed?

• Red

• Green

• Blue

• Violet

Total internal reflection can occur when light travels from:

• A rarer medium to a denser medium

• A denser medium to a rarer medium at an angle of incidence greater than the critical angle

• A rarer medium to a denser medium at any angle

• A denser medium to a rarer medium at any angle

Which of the following represents the approximate wavelength range of visible light?

• 4 nm to 8 nm

• 40 nm to 80 nm

• 400 nm to 800 nm

• 4000 nm to 8000 nm

Two musical instruments play notes of the same pitch and loudness. They will differ in their:

• Frequency

• Wavelength

• Waveform/Timbre

• Velocity

In a Voltage vs. Current (V-I) graph for resistors, a steeper slope indicates:

• Lower resistance

• Higher resistance

• Constant current

• Constant voltage

The heat produced (H) in a resistor is related to current (I), resistance (R), and time (t) by the equation:

• H = IRt

• H = I²R²t

• H = I²Rt

• H = IR^2t