Maths-
General
Easy

Question

In a hall there are 10 bulbs and their 10 buttons. In how many ways this hall can be enlightened?

  1. 102  
  2. 1023  
  3. 210  
  4. 10!  

The correct answer is: 1023

Related Questions to study

General
Maths-

All possible two-factor products are formed from the numbers 1, 2, ----------100. The number of factors out of the total obtained which are multiple of 3 is -

All possible two-factor products are formed from the numbers 1, 2, ----------100. The number of factors out of the total obtained which are multiple of 3 is -

Maths-General
General
Maths-

The number of even divisors of 1600 is-

The number of even divisors of 1600 is-

Maths-General
General
Physics-

In a step-up transformer, the turn ratio is 1:2. A Leclanche cell (e.m.f. 1.5V) is connected across the primary. The voltage developed in the secondary would be

In a step-up transformer, the turn ratio is 1:2. A Leclanche cell (e.m.f. 1.5V) is connected across the primary. The voltage developed in the secondary would be

Physics-General
parallel
General
Maths-

The equation cos invisible function application x plus sin invisible function application x equals 2 has

The equation cos invisible function application x plus sin invisible function application x equals 2 has

Maths-General
General
Physics-

In a uniform magnetic field of inductionB, a wire in the form of semicircle of radiusblank r rotates about the diameter of the circle with angular frequencyblank omega. If the total resistance of the circuit is R, the mean power generated per period of rotation is

In a uniform magnetic field of inductionB, a wire in the form of semicircle of radiusblank r rotates about the diameter of the circle with angular frequencyblank omega. If the total resistance of the circuit is R, the mean power generated per period of rotation is

Physics-General
General
Physics-

A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. The current in transmission line is

A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. The current in transmission line is

Physics-General
parallel
General
Physics-

A coil self inductance L = 0.04 H and resistance R = 12blank capital omega, connected to 220 V, 50Hz supply, what will be the current flow in the coil?

A coil self inductance L = 0.04 H and resistance R = 12blank capital omega, connected to 220 V, 50Hz supply, what will be the current flow in the coil?

Physics-General
General
Physics-

A helicopter rises vertically with a speed of 100 ms-1. If helicopter has length 10 m and horizontal component of earth’s magnetic field is 5 cross times 10 to the power of negative 3 end exponent W b m to the power of negative 2 end exponent commathen the induced emf between the tip of nose and tail of helicopter is

A helicopter rises vertically with a speed of 100 ms-1. If helicopter has length 10 m and horizontal component of earth’s magnetic field is 5 cross times 10 to the power of negative 3 end exponent W b m to the power of negative 2 end exponent commathen the induced emf between the tip of nose and tail of helicopter is

Physics-General
General
Maths-

I f cos invisible function application 2 B equals fraction numerator cos invisible function application open parentheses A plus C close parentheses over denominator cos invisible function application open parentheses A minus C close parentheses end fraction comma blank t h e n tan invisible function application A comma tan invisible function application B comma tan invisible function application C blank a r e blank i n

I f cos invisible function application 2 B equals fraction numerator cos invisible function application open parentheses A plus C close parentheses over denominator cos invisible function application open parentheses A minus C close parentheses end fraction comma blank t h e n tan invisible function application A comma tan invisible function application B comma tan invisible function application C blank a r e blank i n

Maths-General
parallel
General
Physics-

When the speed of a dc motor increases the armature current

When the speed of a dc motor increases the armature current

Physics-General
General
Physics-

A current carrying solenoid is approaching a conducting loop as shown in the figure. The direction of induced current as observed by an observer on the other side of the loop will be

A current carrying solenoid is approaching a conducting loop as shown in the figure. The direction of induced current as observed by an observer on the other side of the loop will be
Physics-General

General
Maths-

The general solution of the equation sin invisible function application x minus 3 sin invisible function application 2 x plus sin invisible function application 3 x equals cos invisible function application x minus 3 cos invisible function application 2 x plus cos invisible function application 3 x is left parenthesis n element of Z right parenthesis

The general solution of the equation sin invisible function application x minus 3 sin invisible function application 2 x plus sin invisible function application 3 x equals cos invisible function application x minus 3 cos invisible function application 2 x plus cos invisible function application 3 x is left parenthesis n element of Z right parenthesis

Maths-General
parallel
General
Physics-

A step up transformer connected to a 220 blank V blank A C line is to supply 22 blank k V a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 blank m A. The turn ratio of the transformer is

A step up transformer connected to a 220 blank V blank A C line is to supply 22 blank k V a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 blank m A. The turn ratio of the transformer is

Physics-General
General
Physics-

A short solenoid of length 4 cm, radius 2 cm and 100 turns is placed inside and on the axis of a long solenoid of length 80 cm and 1500 turns. A current of 3 A flows through the short solenoid. The mutual inductance of two solenoids is

A short solenoid of length 4 cm, radius 2 cm and 100 turns is placed inside and on the axis of a long solenoid of length 80 cm and 1500 turns. A current of 3 A flows through the short solenoid. The mutual inductance of two solenoids is

Physics-General
General
Physics-

The number of turns in primary coil of a transformer is 20 and the number of turns in the secondary is 10. If the voltage across the primary is 220 V, what is the voltage across the secondary?

The number of turns in primary coil of a transformer is 20 and the number of turns in the secondary is 10. If the voltage across the primary is 220 V, what is the voltage across the secondary?

Physics-General
parallel

card img

With Turito Academy.

card img

With Turito Foundation.

card img

Get an Expert Advice From Turito.

Turito Academy

card img

With Turito Academy.

Test Prep

card img

With Turito Foundation.