Hi Krishna,

You can try with below sample code.

In this example, if you select Account, it will display the account id, and account name. If you select Contact, it will display the contact id and contact name. Same for the lead object. You can querry as many feilds as per your requirement.

Component :- 

<aura:component controller="accountDetailController" >
    <aura:attribute name='componentString' type='String' default="Lead" 
                    description='Selected entity type'/>
        <aura:attribute name='sObjList' type='sObject[]' 
                        description = 'Returned list from server side controller'/>
            
            <aura:handler name='init' value='{!this}' action='{!c.changeEntity}' 
                          description = 'Trigger defined action on initialization of component'/>
                
                <div >
                    <lightning:select label='Entity Type'
                                      name='cmpString' 
                                      value='{!v.componentString}' 
                                      onchange='{!c.changeEntity}' >
                        <option value='Account' >Account </option >
                        <option value='Contact' >Contact </option >
                        <option value='Lead' >Lead </option >
                    </lightning:select >
                    
         <table class="slds-table slds-table_bordered slds-table_cell-buffer" >
             <tr >
                 <th >Id </th >
                 <th >Name </th >
             </tr >
             <aura:iteration items='{!v.sObjList}' var="sObj" >
                 <tr >
                     <td >{!sObj.Id} </td >
                     <td >{!sObj.Name} </td >
                 </tr >     
             </aura:iteration >
         </table >
     </div >
    
 </aura:component >

({
	changeEntity : function(component, event, helper) {
        var action = component.get('c.getEntity'); 
         action.setParams({
            "entityType" : component.get('v.componentString') 
        });
        action.setCallback(this, function(a){
            var state = a.getState(); // get the response state
            if(state == 'SUCCESS') {
                component.set('v.sObjList', a.getReturnValue());
            }
        });
        $A.enqueueAction(action);
    }
})

public class accountDetailController {
    
    @AuraEnabled
    public static List<sObject> getEntity(String entityType){
        List<sObject> sobj = new List<sObject>();
        if(entityType != null) {
            String query = 'SELECT Name, Id FROM '+entityType ;
            sobj = database.query(query);
        }
        return sobj;
    }
}

​​​​​​​If the above information helps you, please mark it as best answer so that it can helps others in future.

Regards,

Priya Ranjan