physics

A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

A. 4.0Ω B. 3.0Ω C. 1.5Ω D. 1.0Ω Correct Answer: Option A - 4.0Ω Explanation r = E/I−R r =…

5 years ago

Capacitors are used in the induction coil to?

A. control circuits B. prevent distortion of electric fields C. prevent electric sparks D. dissipate energy Correct Answer: Option C…

5 years ago

Calculate the force acting on an electron of charge 1.5 x 10^-19 placed in an electric field of intensity 10^5Vm−¹

A. 1.5x10-11N B. 1.5x10-12N C. 1.5x10-13N D. 1.5x10-14N Correct Answer: Option D - 1.5x10-14N Explanation F = qE F =…

5 years ago

The angle of deviation of light of various colours passing through a triangular prism increases in the order?

A. red → green → blue B. green → violet → blue C. blue → red → green D. blue…

5 years ago

Total internal reflection will not occur when light travels from?

A. water to air B. water into glass C. glass to air D. glass into water Correct Answer: Option B…

5 years ago

A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at?

A. 0° B. 45° C. 90° D. 180° Correct Answer: Option A - 0°

5 years ago

A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?

A. 0.05m B. 0.15m C. 0.30m D. 1.00m Correct Answer: Option A - 0.05m Explanation hi=(ho×V)/u hi=(1.5×0.1)/3 = 0.05m

5 years ago

If a sonometer has a fundamental frequency of 450HZ; what is the frequency of the fifth overtone?

A. 2700Hz B. 456Hz C. 444Hz D. 75Hz Correct Answer: Option A - 2700Hz Explanation 5th Overtone = 6fo = 6…

5 years ago

What is the velocity of sound at 100°C if the velocity of sound at 0°C is 340ms−¹?

A. 497m−¹ B. 440m−¹ C. 397m−¹ D. 240m−¹ Correct Answer: Option C - 397m−¹ Explanation V∝√T ⇒ V1/√T1=V2/√T2 Using the…

5 years ago