# Jamb 1978

## Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is

Jamb 1978 Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is  A. less than R1 B. greater than R2 C. the sum of R1 and R2 D. the difference of R2 and R1 E. greater than R1 but less than R2 ANSWER: Option A EXPLANATION: Simple! …

## Which of the following is true for the image formed by a convex mirror

Jamb 1978 Which of the following is true for the image formed by a convex mirror? 1. The image is always virtual II. The image is always erect II. The image lies between pole and focus IV. The image is never magnified V. The focal length is negative A. I only B. I and II …

## The density of a solid is defined as the

Jamb 1978 The density of a solid is defined as the A. mass of the solid compared to the mass of an equal volume of water B. amount of water displaced when a unit mass of the solid is immersed in it C. weight per unit volume of the solid D. volume per unit mass …

## If NEPA charges 5k per kWh, what is the cost of operating for 24 hours a lamp requiring 1A on a 200V line?

Jamb 1978 If NEPA charges 5k per kWh, what is the cost of operating for 24 hours a lamp requiring 1A on a 200V line?  A. 24K  B. 55K  C. 40K  D. 26K  E. 32K.  ANSWER: Option A EXPLANATION: refer to the image below!  Previous       Next Or click here to choose!  Of …

## The following are some units l. NS ll. Nm lll. N/m² lV. J/°K V. J/kg What are the units of latent heat?

Jamb 1978 The following are some units  l. NS ll. Nm lll. N/m² lV. J/°K V. J/kg What are the units of latent heat? A. I B. II C. III D. IV E. V ANSWER: Option  E EXPLANATION:  From Q = mL L = Q/m  Q is measured in Joule m is measured in kg …

## In order to convert a galvanometer into an ammeter

Jamb 1978 In order to convert a galvanometer into an ammeter  A. a low resistance shunt is connected in parallel  B. a low resistance shunt is connected in series  C. a medium resistance shunt is connected in series  D. a high resistance shunt is connected in parallel  E. a high resistance shunt is connected in …

## A string is sustaining a stationary wave when

Jamb 1978 A string is sustaining a stationary wave when A. the frequency of the wave is hot proportional to the wavelength of the wave B. the amplitude of vibration is always zero C. two equal waves are travelling in opposite directions D. the waves are longitudinal E. the frequency is directly proportional to the …

## The visible part of light consists of the following colours

Jamb 1978 The visible part of light consists of the following colours: A. red, indigo, infra-red, violet, yellow, green and blue B. red, green, blue, violet, indigo, orange and yellow C. blue, ultra-violet, infra-red, red, yellow, indigo, violet, green and orange, D. infra-red and ultra-violet E. red, orange, yellow, green, blue, indigo and infra-red.  ANSWER: …

## Why is it impossible for the lines of force of an electric field to cross one another

Jamb 1978 Why is it impossible for the lines of force of an electric field to cross one another?  A. like charges repel each other  B. a charged particle is deflected by an electric field  C. like charges are arranged on the same lines of force  D. a positively charged particle can travel in only …

## A gas at pressure P N/m² and temperature 27°C is heated to 77°C at constant volume. The new pressure is

Jamb 1978 A gas at pressure P N/m² and temperature 27°C is heated to 77°C at constant volume. The new pressure is A. 0.85P N/m² B. 0.86P N/m² C. 1.16P N/m² D. 1.18P N/m² E. 2.85P N/m² ANSWER: Option  C EXPLANATION: You remember Gas laws, right? The law that holds for this question is Gay …